cant find the problem vette wont start
Thread Starter
Heel & Toe
Joined: Apr 2017
Posts: 22
Likes: 0
From: milton Indiana
cant find the problem vette wont start
88 TPI convertable cranks no start without spraying fuel into throttlebody and won't pulse injectors
noid light confirmed no injector pulse
40lb at fuel rail
new coolant temp sensor
new pick up coil
TPS .54
VATS module bypass
new 02 sensor
new ignition control module
new coil,cap,rotor,plugs,wires
new ECM new fuel pump relay and MAF relays. Car ran rich when it ran last week and developed a starting issue leading to intermittent starts and long cranking time to start when cold. After driving and engine warmed up the car started first try. After chasing these demons and replacing seemingly everything but the injectors the car now won't start only fired on the cold start injector then dies.Please help I love my car and don't want to ditch the TPI for a carb.
noid light confirmed no injector pulse
40lb at fuel rail
new coolant temp sensor
new pick up coil
TPS .54
VATS module bypass
new 02 sensor
new ignition control module
new coil,cap,rotor,plugs,wires
new ECM new fuel pump relay and MAF relays. Car ran rich when it ran last week and developed a starting issue leading to intermittent starts and long cranking time to start when cold. After driving and engine warmed up the car started first try. After chasing these demons and replacing seemingly everything but the injectors the car now won't start only fired on the cold start injector then dies.Please help I love my car and don't want to ditch the TPI for a carb.
Team Owner
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From: Hartford WI
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Team Owner
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I think you should check your fuel pump by checking the Schroeder valve on the fuel rail and or listening to the pump run.
Also the vats bypass unless 100% done does not stop vats.
To completely get rid of vats...
key resistor, computer tune, cut relay out under dash.
Check codes might show ecm troubles, if it runs when you spray fuel in it then it will run once you get fuel to it.
Fuel filter, vats, fuel pump, fuse, those are my guess.
Also the vats bypass unless 100% done does not stop vats.
To completely get rid of vats...
key resistor, computer tune, cut relay out under dash.
Check codes might show ecm troubles, if it runs when you spray fuel in it then it will run once you get fuel to it.
Fuel filter, vats, fuel pump, fuse, those are my guess.
Last edited by pologreen1; Apr 6, 2017 at 05:12 PM.
Thread Starter
Heel & Toe
Joined: Apr 2017
Posts: 22
Likes: 0
From: milton Indiana
key on 40 PSI at rail. 40 psi while cranking. fuel pump primes for 2 seconds then shuts off then pump kicks back on while cranking. as far as Vats I have the module. car ran previouslywith the module and starter engaging no security light while cranking
Thread Starter
Heel & Toe
Joined: Apr 2017
Posts: 22
Likes: 0
From: milton Indiana
replaced e_c_u with remanufactured unit today after work car cranks over and fires on the cold start injector but dies couple seconds later. so far only plus side of changing ECM was a few of my gauges that were not working before are now working.
Last edited by 88383convertable; Apr 6, 2017 at 06:43 PM.
Race Director
Joined: Oct 2011
Posts: 16,097
Likes: 821
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Injectors are not being pulsed. Have you looked for any shorted injector wires, or by the ICM? I'm not familiar with TPI's, but no injector pulse on an LT1/4 is a possible bad opti. Yes, I know your l98 does not have an opti.
Thread Starter
Heel & Toe
Joined: Apr 2017
Posts: 22
Likes: 0
From: milton Indiana
replaced ICM yesterday to no avail problem still exists no injector pulse going to clean grounds and check injector wiring tomorrow along with the distributor pulse wire to ECU. On a side note Im newbt here and its my first vette 119000 miles on her and it's been a real bummer so far. Hopefully theirs a happy ending to this story lol. I'm trying to bring this old beauty back to its former glory. Any and all replys reguarding suggestions are greatly appreciated.
Last edited by 88383convertable; Apr 6, 2017 at 08:27 PM.
Thread Starter
Heel & Toe
Joined: Apr 2017
Posts: 22
Likes: 0
From: milton Indiana
[QUOTE=383vett;1594473229]Check the injector fuse at the fusebox.[/QUOT
both fuses are good even replaced the fuses just to be sure.
both fuses are good even replaced the fuses just to be sure.
Last edited by 88383convertable; Apr 6, 2017 at 08:28 PM.
Drifting
Joined: Mar 2017
Posts: 1,897
Likes: 165
From: Nashville TN
2017 C4 of Year Finalist
I just had a similar issue. Mine turned out to be the ICM. You can test this by pulling the 4 way connector from the back of the distributor and jumping connector B on the harness (they're labeled) to the positive on the battery while the ignition is turned on. Do this very briefly to avoid burning something out. I believe this sends a signal to the ECM from the ICM to fire the injectors. I did this and my noid light flashed.
Your symptoms sound just like mine did. I know you replaced it but they're known to go out.
Your symptoms sound just like mine did. I know you replaced it but they're known to go out.
Thread Starter
Heel & Toe
Joined: Apr 2017
Posts: 22
Likes: 0
From: milton Indiana
