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Search: Posts Made By: dan5
Showing results 1 to 50 of 121
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Forum: Exhaust
06-29-2021, 03:42 PM
Replies: 6
Views: 1,830
Posted By dan5

Re: Stock TPI Exhaust manifold hardware

A follow up on the lock tabs. I found the bag that I used, they are:
https://www.paragoncorvette.com/p-355051-exhaust-french-locks.aspx

Paragon Reproductions #1161k. They are a little short for...
Forum: Exhaust
06-28-2021, 07:01 PM
Replies: 6
Views: 1,830
Posted By dan5

Re: Stock TPI Exhaust manifold hardware

The following pictures are how the manifolds, heat shields and bolts came off of my '85 LB9 TPI. The bolts are placed nearest the holes as they came out. Some of the studs are double ended for the...
Forum: Carburetors
05-05-2021, 11:27 AM
Replies: 55
Views: 9,874
Posted By dan5

Re: Rochester Quadrajet 10 seconds to crank even after sitting a few hours

I agree that the entire assembly can be replaced instead. My only caution is similar to the reman carb concern. I don't know the distributor type. If it is still mechanical / vacuum, you risk having...
Forum: Carburetors
05-05-2021, 07:40 AM
Replies: 55
Views: 9,874
Posted By dan5

Re: Rochester Quadrajet 10 seconds to crank even after sitting a few hours

I wouldn't buy a reman carb unless I was sure there was a specific defect in what I had and I knew it couldn't be fixed-- such as a bent casting. I don't know how those rebuilders work, but in the...
Forum: Carburetors
05-03-2021, 10:25 PM
Replies: 55
Views: 9,874
Posted By dan5

Re: Rochester Quadrajet 10 seconds to crank even after sitting a few hours

Lot's of good questions here.

First, I am glad to see that you found a JB Weld product that is fuel resistant. Most of their products are NOT epoxy, rather a different polymer mixture that...
Forum: Tech / General Engine
02-26-2021, 08:37 PM
Replies: 18
Views: 5,303
Posted By dan5

Re: Rope alternative - keep valves from dropping into cylinder.

I have done this a number of times using a length of windshield washer hose rather than rope. It is relatively soft and small diameter. What bothered me about rope is that it tends to pick up grit. ...
Forum: TPI
12-17-2020, 10:01 PM
Replies: 5
Views: 421
Posted By dan5

Re: IAC Replacement

I use plumbing sockets like these:
Shower Valve Socket Wrench Set (harborfreight.com)...
Forum: DFI and ECM
11-28-2020, 03:41 PM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

You're welcome. I am glad to be able to help. When I bought the tool, I was not sure how good it would be, even after reading the online manual. But it is very good and it has proven to be a great...
Forum: DFI and ECM
11-25-2020, 08:03 PM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

Tootie, that is what started this thread. The idle was being driven up to 1050-1100 RPM by the tool interacting with the ECM. Depending on the engine temperature, the IAC was running 50-70 counts...
Forum: DFI and ECM
11-25-2020, 07:29 PM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

The tool picks up almost all of the sensors on my 1985 LB9. There may be some differences in the available parameters by model year and ECM. The only omission on my '85 is that there is no knock...
Forum: TPI
11-15-2020, 05:10 PM
Replies: 43
Views: 3,093
Posted By dan5

Re: Vacuum holding throttle body open - need ideas, shave plates?

I'm still a little mystified by your problem. I've just never encountered that. I haven't done throttle design, but was involved in throttle system development and validation. My experience suggests...
Forum: TPI
11-14-2020, 10:15 PM
Replies: 43
Views: 3,093
Posted By dan5

Re: Vacuum holding throttle body open - need ideas, shave plates?

Glad you have a solution, but I am surprised it is that sensitive. To pass FMVSS requirements, the throttle body is designed to close under all operating conditions with a broken spring (from high...
Forum: DFI and ECM
11-05-2020, 07:21 PM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

Remember that ECM controls were still new in the '80s. The first widespread use of O2 sensors for GM was in 1981 and the engineers were still learning. The sensor needs to heat quickly and so needs...
Forum: DFI and ECM
11-05-2020, 08:49 AM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

An additional thought for you. As you diagnose, consider that there is only an O2 sensor on one bank, plus many times reactions of these systems are counter intuitive, meaning that you need to think...
Forum: DFI and ECM
11-05-2020, 08:39 AM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

My Actron 9690 tool actually is a Bosch system based on the software splash screen. It also gives a mass air flow reading of about 2000-3500 around the high idle speed (1000 rpm) area for my V8,...
Forum: DFI and ECM
11-05-2020, 08:33 AM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

I've been through my tool and the manual and it doesn't appear to have a selection for this, but I'll keep looking. I'm tempted to go for the laptop cable and software to see if that's better. I...
Forum: DFI and ECM
10-28-2020, 10:22 PM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

I wouldn't necessarily jump to injectors. For speed to be high, the engine is getting additional air or making more power for the same amount of air. If it is rich, it is more likely to be...
Forum: DFI and ECM
10-27-2020, 03:29 PM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

Yes, my car is running well. I have about another 600 miles or so on it. I did have an anomaly due to a problem with a new IAC. During troubleshooting I installed a new IAC since the original one...
Forum: Tech / General Engine
10-05-2020, 08:30 PM
Replies: 53
Views: 4,435
Posted By dan5

Re: Car dies if idled under ~900rpm

To add to my earlier comments, if you go through the basics and they're good, I would check the carburetor. I have not worked with the Street Demon before, it is a different animal from a traditional...
Forum: Tech / General Engine
10-04-2020, 05:53 PM
Replies: 53
Views: 4,435
Posted By dan5

Re: Car dies if idled under ~900rpm

You have proven that it is possible to to run at 1200 in park / 800 in gear and you know that to do better than that will likely require a torque converter change.
Something changed and you'll need...
Forum: TBI
09-27-2020, 03:49 PM
Replies: 17
Views: 4,451
Posted By dan5

Re: Help with failed emissions, high HC.

The factory manual suggests that if the code 44 is solid, to check the following:

Fuel pressure
Fuel contamination - especially water as "trace amounts near the pickup will cause lean..."
EGR...
Forum: TBI
09-27-2020, 02:47 PM
Replies: 17
Views: 4,451
Posted By dan5

Re: Help with failed emissions, high HC.

Thanks for confirming the TBI. I thought by '92 they had phased that out on the v8s, but no matter, the principles are the same and the diagnostics are very close.
Code 44 is a lean exhaust. There...
Forum: TBI
09-26-2020, 09:18 PM
Replies: 17
Views: 4,451
Posted By dan5

Re: Help with failed emissions, high HC.

Is this a 5.0 TPI rather than TBI? (Since this is TBI section)
High HC usually indicates misfire and if CO is low, then lean misfire. Catalyst is likely OK or your numbers would be further out than...
Forum: Tech / General Engine
09-26-2020, 08:07 AM
Replies: 53
Views: 4,435
Posted By dan5

Re: Car dies if idled under ~900rpm

There can sometimes be benefits to having full manifold vacuum at idle, but it isn't necessarily true that full is better than ported. You need to have the right timing for your engine that is a...
Forum: Tech / General Engine
09-25-2020, 08:12 PM
Replies: 53
Views: 4,435
Posted By dan5

Re: Car dies if idled under ~900rpm

Momentary speed increase as the booster strokes, or continuous? To rule this out (or not), find a safe place where the car is clear in front, set the parking brake and drop in gear without using the...
Forum: Tech / General Engine
09-25-2020, 07:54 PM
Replies: 53
Views: 4,435
Posted By dan5

Re: Car dies if idled under ~900rpm

Well, now you have it idling in park / neutral and it seems normal. Your description is that it can't handle the load in gear without opening the throttle further. Based on your original post, you...
Forum: Tech / General Engine
09-16-2020, 09:20 PM
Replies: 53
Views: 4,435
Posted By dan5

Re: Car dies if idled under ~900rpm

A 625 vacuum secondary is certainly not too much for a 355. Even if it was "too big", something like an 850 double pumper with mechanical secondaries, you should still be able to make it idle, it...
Forum: Tech / General Engine
09-16-2020, 08:25 PM
Replies: 53
Views: 4,435
Posted By dan5

Re: Car dies if idled under ~900rpm

Yes, that pressure is too high and will tend to raise the fuel level in the float bowl or cause flooding if the needle and seat leak. Fuel may drip from the main feed at the booster venturi. Holley...
Forum: Tech / General Engine
09-08-2020, 05:50 PM
Replies: 53
Views: 4,435
Posted By dan5

Re: Car dies if idled under ~900rpm

I understand your comment and reasoning. You are probably correct. I know this is a Camaro board, but physics doesn't care about brands. I can tell you that my 428CJ Mustang had very nearly this...
Forum: Tech / General Engine
09-05-2020, 10:19 PM
Replies: 12
Views: 408
Posted By dan5

Re: 1984 Z28 oil pump replacement - how/what's involved?

If you have good oil pressure (implying normal bearing clearances), there isn't any reason to install a larger oil pump on an otherwise stock small block. That stock pump flows plenty of oil. If...
Forum: Tech / General Engine
09-05-2020, 10:03 PM
Replies: 53
Views: 4,435
Posted By dan5

Re: Car dies if idled under ~900rpm

What kind of ignition coil are you using and can you substitute a different one? That ignition system is likely driving it hard. I've had coils that would give a weak spark. They would run...
Forum: Tech / General Engine
08-28-2020, 08:20 PM
Replies: 5
Views: 353
Posted By dan5

Re: 85 tpi pulsing on cruise

What conditions cause a stall? This may give additional clues. The problems may not be related.

Regarding ignition, it can't hurt to change plugs and wires. If they are original, they may be...
Forum: Tech / General Engine
08-27-2020, 06:50 PM
Replies: 5
Views: 353
Posted By dan5

Re: 85 tpi pulsing on cruise

It could be a number of things. I don't know the conditions when it is stalling. I had a similar condition in a 3800 V6 ("fishbite" lightly jerking feel at cruise and occasional stall at idle) and...
Forum: Tech / General Engine
08-26-2020, 10:07 PM
Replies: 7
Views: 1,290
Posted By dan5

Re: Stock alternator amp rating

My 1985 IROC 305 TPI came with a 108 amp factory rating per the RPO list and the same stamped on the housing. The parts book shows an optional 120 for this application (Vin "F"). I don't know what...
Forum: Tech / General Engine
08-13-2020, 09:13 PM
Replies: 16
Views: 641
Posted By dan5

Re: Chasing 10 year gremlin

Sorry to overload you, but I am going to add one more possibility. I am still trying to address your comment about idle vs driving. Have you replaced the ignition coil? I have seen a case where a...
Forum: Tech / General Engine
08-13-2020, 12:09 PM
Replies: 16
Views: 641
Posted By dan5

Re: Chasing 10 year gremlin

Yes, that is a good thought. Although in all of these cases, including the ignition module, it does seem that you should notice some sign of trouble while driving above idle. Not a stall, but a...
Forum: Tech / General Engine
08-13-2020, 09:20 AM
Replies: 16
Views: 641
Posted By dan5

Re: Chasing 10 year gremlin

Perhaps there is a different way to look at it. I will start by stating the obvious, but sometimes you need to step back and look at the big picture, then consider a process of elimination. You need...
Forum: DFI and ECM
08-10-2020, 08:41 PM
Replies: 35
Views: 1,634
Posted By dan5

Re: Causes for high idle speed-305 LB9

I was finally able to get back to the car today and I think I have it resolved. I picked up a clue from another forum post on the ECM programming section and I confirmed with a section in my service...
Forum: DFI and ECM
08-10-2020, 08:09 PM
Replies: 23
Views: 1,604
Posted By dan5

Re: Open vs Closed Loop Running

Remember that closed loop was only invented to enable dual bed 3-way catalysts for control of NOx. The original catalyst for HC and CO didn't need that precise a level of control. When the emission...
Forum: Tech / General Engine
08-07-2020, 04:08 PM
Replies: 15
Views: 576
Posted By dan5

Re: 89 IROC 305 TPI Intermittent rattle at 1000 rpm.

If you're checking underneath, you might check the flexplate bolts and even get a visual on the flexplate for any obvious cracks. It seems as if you may have something with torsional excitation. ...
Forum: Tech / General Engine
08-06-2020, 09:20 PM
Replies: 34
Views: 1,103
Posted By dan5

Re: 1988 iroc 5.7, Engine won't rotate by hand.

Yes, the flywheel tool is also possible. I have one of those Lisle tools as well, but I think you have more control in this case working from the balancer. In my experience, penetrating oil (4 or 5...
Forum: Tech / General Engine
08-04-2020, 01:04 PM
Replies: 34
Views: 1,103
Posted By dan5

Re: 1988 iroc 5.7, Engine won't rotate by hand.

The adapter really works great. I tried with the crank bolt, but it only takes 65 ft-lb and when you reverse, it comes loose at about the same. I did see in reviews that it is possible to over...
Forum: Tech / General Engine
08-04-2020, 07:04 AM
Replies: 34
Views: 1,103
Posted By dan5

Re: 1988 iroc 5.7, Engine won't rotate by hand.

I don't think you need to remove the rockers and pushrods. That won't make that much difference. I was concerned about having a valve rusted or stuck in the head and bending a pushrod. I tried to...
Forum: Tech / General Engine
08-03-2020, 09:41 PM
Replies: 34
Views: 1,103
Posted By dan5

Re: 1988 iroc 5.7, Engine won't rotate by hand.

I tried that, and it worked for pouring, but I wanted to try to get more of a spray pattern out of the aerosol. I tried spraying through the tubing, but it lost its punch. These really do the job,...
Forum: Tech / General Engine
08-03-2020, 08:25 PM
Replies: 34
Views: 1,103
Posted By dan5

Re: 1988 iroc 5.7, Engine won't rotate by hand.

What I learned on TPI is that if the ambient conditions are right, those long runners are a great collector of condensation and they will funnel it into a cylinder.with an open intake valve. On my...
Forum: Tech / General Engine
08-03-2020, 07:46 PM
Replies: 34
Views: 1,103
Posted By dan5

Re: 1988 iroc 5.7, Engine won't rotate by hand.

I have recently been through this with my '85. It was rusted and wouldn't turn. The advantage of going through this process is the opportunity to save the original matching engine block. It is a...
Forum: DFI and ECM
08-03-2020, 11:32 AM
Replies: 3
Views: 310
Posted By dan5

Re: 87 trans am LG4 ECM # ?

My favorite reference is:

www.gmpartswiki.com (http://www.gmpartswiki.com)

This site has many old GM parts catalogs posted. Use the search page to find what you want.

This is the ECM page...
Forum: TPI
08-01-2020, 03:01 PM
Replies: 15
Views: 846
Posted By dan5

Re: Messes up

You could at least pull a couple and check them. If it was running before, they're probably all right. Fuel fouling will usually burn off. You can also clean them with solvent like carb cleaner....
Forum: TPI
08-01-2020, 02:50 PM
Replies: 15
Views: 846
Posted By dan5

Re: Messes up

Each side of the file has a different pitch or threads per inch. You pick the one that fits the thread pitch that you are working on. The file will guide in the good threads and overlap to the bad...
Forum: TPI
08-01-2020, 02:11 PM
Replies: 15
Views: 846
Posted By dan5

Re: Messes up

If you want to save the threads, use one of these thread file tools. I keep a metric and an SAE version in my toolbox, they work great....
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