Well, my 94 has intermittently been experiencing a brief surge when it gets up to operating temperature. I've noticed it 3-4 times in the last couple weeks, and I don't drive it much.

I've read countless threads on the subject, but nobody seems to be able to isolate the solution to the issue.

Would replacing the fuel pump/filter be prudent? I have no codes, no lights, no skipping or any other issues, just the occasional surge.

Thoughts? Thanks gang. Here's a pic of the ol' girl.

 

How does it run when it is at operating temperature????

Have you connected a scanner and read the data when it is doing this 'surging'????

Have you verified the fuel pressure when running and also if it holds pressure when you shut it off????

Also..how much do you drive it????

DUB

 

1. Perfectly
2. Nope
3. No
4. about 1500 miles/year...no kidding. Most trips are 3-4 mile drives to run errands around town.

 

Doesn't really sound like a problem but some throttle body cleaner spray to clean off any carbon build up on throttle body around where the throttle body butterfly couldn't hurt.
Also while you are there after that get a plastic water bottle with a nipple end and raise engine rpm to about 2000 and slowly and at a steady stream squirt water into the engine and don't let it die out. Try and get about a quart through the engine.
Pouring water into a running engine burns up carbon and cleans out the heads and valve train and the spark plugs nicely and sometimes cures engine off Idles stumbles and engine hunting.

 

Thanks for the answers to the questions I wrote....many people don't and it gets hard to help if information is not passed along.

I can write this.....much like I tell people who come by my shop for service. If an engine has a bad running issue at operating temperature I CAN FIX THAT.....if it has a cold start issue...I CAN FIX THAT.....but if it stumbles and surges WHILE it is getting to operating temperature...AND...it is not driven a lot and sits quite often....I will have a hard time getting THAT PROBLEM repaired because I have to try to find the problem when it is at a temperature that is above cold...but under normal operating temperature...and as we know...it will not be at that temperature long enough to worry about.

ALSO...I also let my customers know that if they are trying to keep miles off the engine and such...and taking it on short drives...The main thing is to make sure it ALWAYS gets to operating temperature and then is run/driven for at least a half an hour. So the moisture in the oil can be 'boiled out'..so-to-speak.

Also...taking it SAFELY out on the expressway and getting the engine to rev up when getting on the expressway will also aid in removing carbon build up due to 'parading it around' in town and not letting the engine stretch its legs...so to speak. I can not tell you how many Corvettes I have dealt with that have been 'babied' so much that when they come in due to an issue much like you have...it only took blowing the carbon out of it. A few 'blasts' until I see no black smoke coming out of the exhaust....usually does it...and when I get back to the shop...the engine is idling perfectly.

DUB