C4 rough running after kick down
Thread Starter
2nd Gear
Joined: Oct 2014
Posts: 2
Likes: 0
C4 rough running after kick down
Help please!!!
My 1989 corvette c4 has just come back from the shop after new fuel filter, oil and filter, new injectors, new cap and rotor and new ignition.
Problem is it went in for rough running and after driving 20 miles the same problem came up after booting it and the kick down happened, went up to 90 mph to see how she ran and after slowing down a bit she is misfiring all over the place and won't idle nice so you have to brake and accelerate at the same time to keep it running!
I am at a loss! Any suggestions?
Thanks in advance,
Lenny
My 1989 corvette c4 has just come back from the shop after new fuel filter, oil and filter, new injectors, new cap and rotor and new ignition.
Problem is it went in for rough running and after driving 20 miles the same problem came up after booting it and the kick down happened, went up to 90 mph to see how she ran and after slowing down a bit she is misfiring all over the place and won't idle nice so you have to brake and accelerate at the same time to keep it running!
I am at a loss! Any suggestions?
Thanks in advance,
Lenny
Drifting
Joined: Aug 2010
Posts: 1,704
Likes: 8
Belive me Lenny,lot of skilled guys here,you can have or issue fixed in less than 6 posts here.I think any chevy dealers in the country haven't the technical resouces/know how our guys here have,but it's a warranty fact,they have to give you what you pay for....
Alberto-Italy
Alberto-Italy
Last edited by tunedport85inject; Oct 22, 2014 at 09:56 AM.
Instructor
Joined: Sep 2012
Posts: 125
Likes: 5
That sounds like its an opti spark distributor issue. If you have to hold the gas and the brake at the same time that is a tell tale sign. The misfire also is an indication of a faulty opti. I went through that a few years ago and with a new dist it worked perfect. Also I don't know why the shop would have changed Injectors without testing them that is plain poor mechanics.
Edit: I'm sorry I didn't read the engine so disregard that earlier writing of mine. Have you checked fuel pressure yet?
Edit: I'm sorry I didn't read the engine so disregard that earlier writing of mine. Have you checked fuel pressure yet?
Last edited by Chad30021; Oct 22, 2014 at 08:18 AM.
