doowoptom

My 95 'vette runs fine on the highway but occasionally when accelerating the acceleration is not smooth. Immediately after in stop and go traffic, stop signs, lights the engine runs rough when stopped in drive as if it's going to stall.
I've had a complete tune-up, new oxygen sensors, new SAP sensor, new PVC valve and hose. I've used Techtron fuel line cleaner but the problem still exists.
Any suggestions as to what the problem is and how to correct it.
Any help is appreciated

Canoot

I had the same issue. Check your fuel injectors for operation: take a wooden stick and while the engine idles, place the stick on each injector and then up to your ear. They should be clicking at a pretty steady rate. I had one bad one that once replaced the car ran smooth again.

doowoptom

Thank you for the advice. I'm going to have the injectors checked out and hope this is the final solution.


Once again, thanks
doowoptom

Canoot

Sure thing.

Some other thoughts (derived from experience):

• EGR is bad (if stuck open will cause rough idle and poor performance)
• Fuel pressure too low
• Bad/deteriorated hoses from the gas vapor recovery system
  I had this one too; you can smell fuel with this issue. Car idled really bad until I replaced these hoses, esp the hose between the intake manifold and the purge valve

Good luck. If it turns out to be none of these issues, please share, in case I have a rough idle again.

1800Wing

How many miles on the car ? driven regular or does it sit up unused ?

later, tiny

doowoptom

Actually, there is a fuel smell when I turn the engine off or when I rev it up when it runs rough. I'll try replacing the hoses first as I'm sure replacing the fuel injector(s) will be more expensive.
Again, thanks for the info

doowoptom

Tiny:


The car has 68,000 miles on it and I take it out once or twice a week.


Know any good 'vette mechanics on L.I.?
Thanks,doowoptom

07shane

I have had four 02 sensors replaced. each time the car will run fine for a couple three months and then it will act up again. I had a oil leak that was hitting the sensor so I had it fixed then replaced the sensor again. It's once again running rough exhaust smells from running rich. Gas millage is horrible. then check engine light comes on and it runs good until the light goes off. Their is no rime or reason of when the light will come on or how long it will stay on.
someone please help! I'm ready to just get rid of the car.

Canoot

From your description, it really does sound like a bum fuel injector. I just found one on mine (cyl 8) when it started running rough again. I took a wood stick and listened to each one and sure enough cyl 8 wasn't clicking. In fact it was barely working (I took them all out and attempted a poor man's cleaning). To compensate for this bad injector, the computer ran the other injectors rich on the driver's side and one of my O2 sensors bit the dust.

I got 8 rebuilt ones from RockAuto (about $300), swapped them out, fixed the O2 and now everything runs well -- and has been for over 6 months.

antfarmer2

Jon at fic will give you a better deal on injectors look at the adds to the right.

csthews

If you smell fuel when you shut the car off, you may be looking at a bad fuel pressure regulator. Easy to check. Pull the tube off the top, and check for gasoline smell. You can also have someone turn the key to the on position and see if gas squirts out the top of the diaphragm. Of course, if you do this, run the tube from the top of the regulator into a coke bottle.....don't want to burn the car down.

07shane

thanks! I will check injectors. I already replaced fuel regulator a couple of 02 sensors earlier.