TPI runs great, until shut off
12-17-2015, 01:12 AM
#1
Junior Member
Thread Starter
Join Date: Mar 2014
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
TPI runs great, until shut off
I have a lb9 305 TPI engine (91 z28), the interesting thing is the engine runs amazingly until it is shut off. As soon as it is shut off and restarted, the engine stutters and sputters unless it is WOT. It does not have any codes showing.
I have replaced the MAP sensor and the ignition control module in the distributor. Any one ever heard of this before? Any help would greatly appreciated!
I have replaced the MAP sensor and the ignition control module in the distributor. Any one ever heard of this before? Any help would greatly appreciated!
Last edited by dwave; 12-21-2015 at 12:00 PM.
12-18-2015, 03:08 PM
#3
Junior Member
Re: TPI runs great, until shut off
My experience with small blocks doing this can be a few different issues (usually carbed) but start with carbon deposits, use some carb cleaner clean out the valves and pistons. Also clean your throttle body and Iac passage, start with that see how it runs for you!
12-18-2015, 04:25 PM
#4
Supreme Member
iTrader: (8)
Join Date: Oct 2001
Location: Il
Posts: 11,734
Received 795 Likes
on
528 Posts
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: TPI runs great, until shut off
Could be any number of things, I'd start with above and also check for a leaking fuel injector.
12-20-2015, 11:51 AM
#5
Re: TPI runs great, until shut off
Sounds like engine run-on (or "dieseling"). Probably ignition related... once power to ignition is shut off, the engine should shut off immediately.
Try this...
Let the car idle, and then disconnect the power to the distributor coil manually. Can probably just unplug the 12V to the coil. If the engine shuts off properly, my guess is you have some issue that's keeping the ignition energized after the key is turned off.
Try this...
Let the car idle, and then disconnect the power to the distributor coil manually. Can probably just unplug the 12V to the coil. If the engine shuts off properly, my guess is you have some issue that's keeping the ignition energized after the key is turned off.
12-21-2015, 11:56 AM
#6
Junior Member
Thread Starter
Join Date: Mar 2014
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Re: TPI runs great, until shut off
The engine shuts off right away, it doesn't run on, sorry I should have put that better, I juse reread how I wrote that. The interesting thing is I can run it for an hour and shut it off, walk in to Mcdonalds to get a burger and the car will run terrible when I start it back up.
I'll try the suggestions and see what happens, thanks!
I'll try the suggestions and see what happens, thanks!
Last edited by dwave; 12-21-2015 at 11:59 AM.
Trending Topics
12-21-2015, 12:24 PM
#8
Supreme Member
iTrader: (8)
Join Date: Oct 2001
Location: Il
Posts: 11,734
Received 795 Likes
on
528 Posts
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: TPI runs great, until shut off
Check the ecm coolant sensor.
12-21-2015, 02:15 PM
#9
Junior Member
Re: TPI runs great, until shut off
Also check the intake air temp sensor!
12-21-2015, 07:21 PM
#10
Re: TPI runs great, until shut off
When you start it back up, it goes into open loop for about a minute. Can you keep it running for a few minutes to see if it smoothes out after it gets back into closed loop?
12-22-2015, 06:20 AM
#11
Junior Member
Thread Starter
Join Date: Mar 2014
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Re: TPI runs great, until shut off
You can keep it running, I drove it for 6 miles running like a pile of crap just to get home. It does not smooth out.
Thread
Thread Starter
Forum
Replies
Last Post