1990 runs rough
Thread Starter
Racer
Joined: Jan 2007
Posts: 303
Likes: 0
From: Tulsa Ok
1990 runs rough
I have a friend who just bought his 1990 vert, it will run OK when cold but after it has ran for a few minutes it will just bearly run and dies if you try to drive it , I have a 2k and a 07 but I know nothing about the C4's any help will be great, he is going to try to pull the codes tonight so I will post more tomarrow. Bassspring
Safety Car
Joined: Jan 2006
Posts: 3,566
Likes: 4
From: Mt Laurel NJ
St. Jude Donor '06-'07
Bass,
Sounds like the car could need new fuel injectors. If they have not been replaced, that is the first thing I would look at. Do a search on Ohming injectors, they should read about 16.5 ohms. If they are lower, they need to be replaced. Contact forum member FIC injectors, they will fix you up w/ what you need for a fair price. Also do a search on Sam Lam, he posted a injector swap out how-to that is hard to beat.
Good Luck,
Randy
Sounds like the car could need new fuel injectors. If they have not been replaced, that is the first thing I would look at. Do a search on Ohming injectors, they should read about 16.5 ohms. If they are lower, they need to be replaced. Contact forum member FIC injectors, they will fix you up w/ what you need for a fair price. Also do a search on Sam Lam, he posted a injector swap out how-to that is hard to beat.
Good Luck,
Randy
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
not as familiar with the L98 engine, but if it happens after it has heated-up enough to go into 'closed loop' mode (o2 sensor feeds info to PCM to regulate fuel quantity), it could also be bad o2 sensor(s), either shorted-out on the exhaust or bad due to age or contamination.
On the 94, the diagnostic mode can be used to tell when the engine is in 'closed-loop', not sure about the 90, but recommend reviewing the FSM for the procedure, in case it can.
On the 94, the diagnostic mode can be used to tell when the engine is in 'closed-loop', not sure about the 90, but recommend reviewing the FSM for the procedure, in case it can.
