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Search: Posts Made By: Schurkey
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Forum: TBI
05-03-2024, 08:48 PM
Replies: 23
Views: 368
Posted By Schurkey

Re: 1989 camaro 305 tbi massive engine surge idle and driving.

1. Faulty fuel pressure gauge. Have you verified that the gauge is accurate?
2. Restriction in the fuel return plumbing. Pinched hose, crimped tube, cockroach got inside the fuel pressure regulator...
Forum: TBI
04-30-2024, 10:20 PM
Replies: 23
Views: 368
Posted By Schurkey

Re: 1989 camaro 305 tbi massive engine surge idle and driving.

All he has to do is connect a scan tool and find out if the sensors are providing faulty data. An ohmmeter could be used, but that's an enormous pain in the asp.

Diagnosing a computer-controlled...
Forum: TBI
04-30-2024, 04:41 PM
Replies: 23
Views: 368
Posted By Schurkey

Re: 1989 camaro 305 tbi massive engine surge idle and driving.

You haven't tried to "adjust" the idle speed...did you?

The idle speed is computer-controlled. The only "adjustment" is done at the factory, using the base-idle screw which is then helpfully...
Forum: TBI
04-28-2024, 09:25 PM
Replies: 6
Views: 158
Posted By Schurkey

Re: 305 TBI Camaro stalls like it’s under vapor lock

Disconnect the battery for thirty seconds, then reconnect. That'll clear the fuel trims. Vehicle may have had extremely rich fuel trims with the plugged filter. Now the engine runs rich until the...
Forum: TBI
04-25-2024, 10:11 PM
Replies: 22
Views: 429
Posted By Schurkey

Re: '84 Camaro: Decent first car?

My ancient '66 Biscayne, and later the '69 Impala got four studded tires. I took a lot of crap from folks who saw studded snow tires on the front.

Then I'd ask them "which wheels do all the...
Forum: TBI
04-24-2024, 09:29 PM
Replies: 23
Views: 368
Posted By Schurkey

Re: 1989 camaro 305 tbi massive engine surge idle and driving.

Verify fuel pressure at prime, and with the engine under load.

Assure all the tune-up items are in good shape.

Connect a scan tool, verify ALL sensors and computer outputs. Look at the fuel...
Forum: TBI
04-24-2024, 09:14 PM
Replies: 6
Views: 158
Posted By Schurkey

Re: 305 TBI Camaro stalls like it’s under vapor lock

Dozens of things this could be.

Verify fuel pressure and injector spray at the TBI when the engine stalls.

Check for spark immediately after the engine stalls. Use a spark-tester calibrated for...
Forum: TBI
04-23-2024, 05:14 PM
Replies: 22
Views: 429
Posted By Schurkey

Re: '84 Camaro: Decent first car?

Generations of people got shitboxes as their first car. If you have to have your parent's permission, you should be happy with what they select.

When you can buy your own car, pay for your own...
Forum: TBI
04-10-2024, 07:13 PM
Replies: 2
Views: 85
Posted By Schurkey

Re: Code 32 and Code 44

WHAT VEHICLE? WHAT ENGINE?

What is the fuel pressure at prime, and at highway speed when the codes set?

Assure that all the usual "tune-up" parts/procedures are in acceptable condition: Cap,...
Forum: TBI
04-03-2024, 06:11 PM
Replies: 5
Views: 282
Posted By Schurkey

Re: rough idle

Key on, 12 psi for about two seconds...rapidly dropping to zero after that. Right?

Engine running, alternator brings the voltage up, pump runs faster. But the regulator is screwed-up, because the...
Forum: TBI
04-03-2024, 02:03 PM
Replies: 12
Views: 329
Posted By Schurkey

Re: Need help fast!!

I had a Snap-On MTG2500 for almost 20 years, purchased used from a seller on eBay, with additional adapters and software cartridges also purchased used from eBay.

When the MTG2500 died, I replaced...
Forum: TBI
03-28-2024, 12:09 AM
Replies: 19
Views: 268
Posted By Schurkey

Re: Ignition Issue

Kinda suspecting a faulty ignition switch. Could be a failing battery, or a starter that draws excess amperage, though.
Forum: TBI
03-27-2024, 12:59 PM
Replies: 19
Views: 268
Posted By Schurkey

Re: Ignition Issue

Yeah, an ordinary spark plug is better than nothing. However, it's a poor test of the voltage capacity of the coil. A spark plug in air takes very little voltage to jump the gap; and it won't jump...
Forum: TBI
03-26-2024, 08:13 PM
Replies: 11
Views: 413
Posted By Schurkey

Re: Have a 350 flat tappet lo5, best route to power?

Did they use the correct intake gaskets? The TBI manifold uses "special" gaskets that don't have a functional coolant hole at the rear. A steam port rather than the open hole. You would NOT want...
Forum: TBI
03-26-2024, 07:52 PM
Replies: 16
Views: 595
Posted By Schurkey

Re: New girl in town

Go to a decent auto-parts store that has a loaner-tool program. O'Reillys and AutoZone around here, other stores in other locations, I suppose.

Get a fuel-pressure testing kit from the...
Forum: TBI
03-26-2024, 07:44 PM
Replies: 2
Views: 113
Posted By Schurkey

Re: Still no spark

Is there an echo in here?

Does the engine not crank, or does it crank but not start? HUGE difference in diagnostics depending on which failure you have.

Kinda guessing that it cranks, but won't...
Forum: TBI
03-26-2024, 07:37 PM
Replies: 19
Views: 268
Posted By Schurkey

Re: Ignition Issue

Does the engine not crank, or does it crank but not start? HUGE difference in diagnostics depending on which failure you have.

Kinda guessing that it cranks, but won't start and run.

1. Does...
Forum: TBI
03-16-2024, 04:16 AM
Replies: 12
Views: 329
Posted By Schurkey

Re: Need help fast!!

"New" doesn't mean the system works properly. If the passages cast into the head or intake manifold are plugged with carbon, the EGR quits working, detonation increases, and the computer retards the...
Forum: TBI
03-15-2024, 06:38 PM
Replies: 12
Views: 329
Posted By Schurkey

Re: Need help fast!!

Connect a scan tool, view the data stream--verify EVERY sensor and computer output. Check fuel trims. "Codes" can be helpful. The REAL diagnostic power is in the data stream.

How old are the usual...
Forum: TBI
03-11-2024, 02:44 AM
Replies: 25
Views: 839
Posted By Schurkey

Re: TBI to Holley Sniper EFI Swap?

THAT tells me everything I need to know.

You have actual problems with the system, and you're on your own. Good luck.
Forum: TBI
03-07-2024, 01:01 AM
Replies: 6
Views: 260
Posted By Schurkey

Re: Adjustable fuel pressure reg

WHY do you need an aftermarket fuel pressure regulator? What's wrong with the one you already have, built-into the TBI unit?
Forum: TBI
03-02-2024, 11:06 PM
Replies: 13
Views: 435
Posted By Schurkey

Re: Crank Won't Start and rough idle woes

Of course. How do you think these vehicles were fixed when they were new?

I have an extensive description of a REAL (but obsolete) scan tool's capabilities when used on an '88 K1500. Other tools...
Forum: TBI
03-02-2024, 01:34 AM
Replies: 13
Views: 435
Posted By Schurkey

Re: Crank Won't Start and rough idle woes

Failed sensor(s) or wiring can cause massive fuel dumping via the injectors. A disconnected/rotted/broken harness from the coolant temp sensor, for example. The computer thinks it is -40 and...
Forum: TBI
02-25-2024, 04:39 AM
Replies: 13
Views: 435
Posted By Schurkey

Re: Crank Won't Start and rough idle woes

1. Fully charge the battery, assure that the battery cables are clean, tight, not corroded internally or externally. 12.4 is way too discharged.

2. Connect a scan tool, verify ALL sensors,...
Forum: TBI
02-13-2024, 04:06 AM
Replies: 21
Views: 500
Posted By Schurkey

Re: Minimal Surge Every Now and Then

When it was my money, I bought a Snap-On Solus Pro used, from a seller on eBay. I would rather have a used-but-usable Professional-grade scan tool than a brand-new consumer-grade tool.

This was...
Forum: TBI
01-23-2024, 05:47 PM
Replies: 21
Views: 500
Posted By Schurkey

Re: Minimal Surge Every Now and Then

This is why I dislike folks testing sensors with a multimeter. It takes ten times as long and gives potentially inaccurate results, and always incomplete results.

You'd not have had that problem...
Forum: TBI
01-23-2024, 12:08 PM
Replies: 21
Views: 500
Posted By Schurkey

Re: Minimal Surge Every Now and Then

Did you test the sensor independently, or with a scan tool? The scan tool is much preferred.

Sounds like you found "a" problem, even if it isn't "the" problem. Fix the TPS, see what happens on...
Forum: TBI
01-22-2024, 07:00 PM
Replies: 21
Views: 500
Posted By Schurkey

Re: Minimal Surge Every Now and Then

Connect a scan tool, verify EVERY sensor and all the computer outputs, especially electronic spark advance and the IAC system.

How old are the usual "tune-up" items--cap, rotor, plug wires, spark...
Forum: TBI
01-09-2024, 09:42 AM
Replies: 19
Views: 760
Posted By Schurkey

Re: Oxygen sensor wire cut need help

Voltage on the ground cables can't be helping, but that's not the first thing that I'd think of for a rich idle and normal-fueling above idle; or for stalling.

Wild Guess: Leaking injector(s)...
Forum: TBI
01-09-2024, 12:25 AM
Replies: 19
Views: 760
Posted By Schurkey

Re: Oxygen sensor wire cut need help

No. Remove both (all three?) ends, polish with Scotchbrite pads and/or a wire brush until all mating surfaces are shiny. Battery post(s) and cable end(s), cable end + fender, cable end + engine....
Forum: TBI
01-08-2024, 02:33 PM
Replies: 19
Views: 760
Posted By Schurkey

Re: Oxygen sensor wire cut need help

Clean BOTH ends of the negative battery cable? (Three ends, if it also bolts to the fender.)
Forum: TBI
01-04-2024, 10:33 PM
Replies: 3
Views: 201
Posted By Schurkey

Re: K&N 66-1401 X-STREAM TOP FILTER - 305

Connect an air filter restriction indicator to the clean side of the air filter housing. Verify an actual lack of adequate airflow through the existing filter.
I bought one air filter restriction...
Forum: TBI
12-29-2023, 05:39 PM
Replies: 78
Views: 44,519
Posted By Schurkey

Re: Large cap HEI for TBI engine

Turn off your ad-blocker.
Forum: TBI
12-27-2023, 09:21 PM
Replies: 19
Views: 760
Posted By Schurkey

Re: Oxygen sensor wire cut need help

Connect a scan tool, verify EVERY sensor and computer output.

What is the fuel pressure?

How old are the usual tune-up items--distributor cap, rotor, plug wires, plugs? Inspect the PCV and EGR...
Forum: TBI
12-27-2023, 09:18 PM
Replies: 3
Views: 264
Posted By Schurkey

Re: Alternator fusible

Is this the alternator output wire?

What gauge wire was the original?


What is your alternator's rated output amperage? Kinda guessing it's enormously more than ten amps.


Using what...
Forum: TBI
12-12-2023, 10:45 PM
Replies: 30
Views: 5,462
Posted By Schurkey

Re: high idle for no apparent reason

Have you connected a scan tool to see if the computer can control the IAC? Have you verified ALL the other sensors and computer outputs?

A perfectly-functional IAC will not control the idle if...
Forum: TBI
12-04-2023, 05:05 PM
Replies: 84
Views: 19,023
Posted By Schurkey

Re: Heater Valve Deleted...How To.

If this were me--and it isn't, because I'd FIX the car instead of bypassing the heater core--I'd NOT connect the heater supply and return hoses together allowing unrestricted flow through the...
Forum: TBI
11-29-2023, 03:28 PM
Replies: 19
Views: 760
Posted By Schurkey

Re: Oxygen sensor wire cut need help

I'd have thought that you'd have a one-wire O2 sensor. There is no "O2 ground wire". Am I wrong?
Forum: TBI
11-29-2023, 03:16 PM
Replies: 78
Views: 44,519
Posted By Schurkey

Re: Large cap HEI for TBI engine

WHY? EGR is not hurting performance, and it does a lovely job of suppressing part-throttle detonation.


WHY? A high-flow, monolithic catalyst is not hurting performance. Better to replace the cat...
Forum: TBI
11-29-2023, 12:48 AM
Replies: 19
Views: 760
Posted By Schurkey

Re: Oxygen sensor wire cut need help

Huh? It's cut on the sensor side, but the O2 side is good?

Is it cut on the O2 Sensor side or the vehicle harness side of the sensor connector?

If the break in the wire(s) is near the steering...
Forum: TBI
11-17-2023, 12:18 PM
Replies: 6
Views: 333
Posted By Schurkey

Re: New Fuel Pump No Prime

Failure to run at all, even with a 2-second prime command at the pump, is either the pump or the ground PROVIDED that the 2-second prime command has enough amperage to run the pump. It's possible...
Forum: TBI
11-17-2023, 05:42 AM
Replies: 6
Views: 333
Posted By Schurkey

Re: New Fuel Pump No Prime

If the pump has power and ground--and I mean the pump, not merely the wiring harness near the pump--but the pump won't run...

...replace the pump.

The in-tank wire harness is often corroded....
Forum: TBI
11-14-2023, 04:27 PM
Replies: 2
Views: 271
Posted By Schurkey

Re: TBI floods

Connect a scan tool, verify ALL the sensors and computer outputs. In particular, assure that the coolant temp sensor is reading correctly.


I have no idea what pumping the pedal is supposed to...
Forum: TBI
11-05-2023, 03:27 PM
Replies: 10
Views: 801
Posted By Schurkey

Re: TBI mods for stock engine

There are several different styles, and they are adjustable. Until GM melts metal to make them "tamperproof".

Some guys have removed the melted metal to make them adjustable again. I've wrecked...
Forum: TBI
11-04-2023, 03:39 PM
Replies: 10
Views: 801
Posted By Schurkey

Re: TBI mods for stock engine

Could be useful if the throttle body shaft supports are worn. Verify first. And if you do this, be absolutely sure to remove the staked part of the throttle shaft threads that hold the throttle...
Forum: TBI
10-27-2023, 11:31 AM
Replies: 4
Views: 422
Posted By Schurkey

Re: is a 1992 silverado tbi unit a direct bolt on?

ASSUMING we're talking about a V-6 or small-block TBI, you'd contend with the throttle lever, TPS, and potentially different/missing vacuum ports in addition to injector rating.

Big-block TBI is...
Forum: TBI
10-12-2023, 02:24 AM
Replies: 1
Views: 528
Posted By Schurkey

Re: TV cable bracket

Does the throttle open all the way? Really common for the gas pedal rod to bend, causing the throttle cable to only pull the throttle open 3/4 or 7/8 of the way. The rod on the gas pedal has to be...
Forum: TBI
10-12-2023, 02:13 AM
Replies: 4
Views: 360
Posted By Schurkey

Re: 305 TBI 91 Camaro M/T idle and run help!

Connect a scan tool, verify EVERY sensor and computer output.

Verify vacuum booster. Pinch the hose shut, see if the idle is still screwed-up.

Another somewhat common vacuum leak is where the...
Forum: TBI
10-09-2023, 12:13 AM
Replies: 4
Views: 462
Posted By Schurkey

Re: 350 Injectors

Is there any actual evidence that the "ultimate TBI mods" do any good?

Strikes me as wasted effort, with the side effect of screwing-up the anti-corrosion plating of the throttle body.

...
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