Ok, so almost every time i have to slow down for a stop sign or red light or something, or if i'm just idling my car will just stall. It started when I put fuel injection cleaner in my car, but at first it was a rare occurance and i would just put it in neutral and start it over and it would be fine, maybe once a day or two days. Some people were saying that it might be the fuel filter clogged with a bunch of debris because of the cleaner, so I replaced it (and it was very clogged) and the car ran like a dream for a few hours. That was yesterday, and after it ran like a dream it started to run like a nightmare and would stall constantly, everytime i went under 10mph, and i would put it in neutral and have to start it again like four times, and for it to actually work right i'd have to get it up to about 3500-4000rpms and then when it got to about 1000 or 1100 put it in drive and take off. And i'm tired of looking like I'm driving a standard and suck at it, so any ideas?

I won't lie, the Navy doesn't pay to well so I tried to save money by using regular gas instead of premium, and some people said that that is probably the problem. Do you think that could actually be the cause of constant stalling?

And while I'm at it, every once in a while the "Low Tire Pressure" and "Service LTPWS" lights come on, and then go off a couple of minutes later. I can figure out what the Low tire pressure light means, but what is LTPWS?

Thanks

 

The grade of gas your using isnt the issue. 87 or 89 will work just fine in the L98 as long as your not knocking.

If the filter was clogged and its still stalling its possible that the fuel injectors may be clogged as well. I'd take them off and have them cleaned out or replaced. You might want to clean out the tank too. Sounds like there is a lot of crap in there.

 

I doubt very much that using regular in the car has caused the problem, I've been using it (87 octane) for 7 years in my 87 without a problem. What I might suggest is that your injector cleaner had a job on its hands, if your filter was clogged bad, think about what the filter (sock) in your tank might look like. It's very easy to remove the fuel pump, 20 minute job, check out the sock (filter) it's about $10. after that, I'd even replace the inline filter again.

 

It idle air control motor is responsible for maintaining idle. I would suggest checking this also.

 

It would be a good idea to remove the throttle body and clean it along with the IAC that is mounted on the bottom of it. Thes two items get carbon filled and will effect the idle. If the fuel filter was clogged really bad it is likely that the injectors got some of the trash as well. The fuel pump has a strainer on the bottom and a sock wrapped around it. Over time both wear out and become brittle and stop doing there job effectively. To pull the injectors is a pretty big job on a L98 vette, as the plenum has to be removed to get to them. Do you have a fuel pressure guage handy as the pump might be on it's way out as well or bad connection. I agree with the suggestions above.

BTW, how many miles on the car/injectors??

 

The car has 96,550 miles on it.

I'm thinking I'll take it to a chevy dealership service center or some shop that specializes in corvettes and ask them if they can figure out what the problem is for sure so that i don't go spending a bunch of money on things i don't need.

 

I was a petty officer in the Navy (AQ2, 'dead' rating) in the 1980s, so I know what you are talking about as far as pay!



I don't think the type of gas is the problem - these L98s were designed to run decently on relatively low grade stuff.

I would try posting to C4 Tech/Performance and asking the same questions - I think there might be something to Pete K's and RRT vette's IAC suggestions...

...good luck!

 

I'm telling ya its a fuel related problem, there are ways to check each component of the fuel injection system. I'd do that before you start buying things that you may not need. Yes the IAC could be dirty but it wouldnt cause the car to stall constantly like that. Mine was bad and it didnt cause the car to stall unless I sat still for about 3 minutes and the car was warmed up.

Test the fuel system first, if all is good, then see about replacing the IAC, its like $30.

 

In fairness to the guys that suggested an IAC problem, I only saw recommendations for checking. I did not happen to see the suggestion of replacing it, until you suggested it.

 

thats what i'm going to do, but my problem is i'm car illiterate so i have no idea how to check anything or do anything, my capability to do stuff to my car stops at changing a tire. that's why i'm going to take it somewhere and let them figure it out.

 

Unfortunately, any of the tech info in this thread will be of little use. Most true professional techs do not appreciate the advise of forum members, as we are not typically in the business of auto repair. I printed some info off once to bring to a paint shop and the were insulted that I did so. Find someone you trust to look at your car. Parts swapping gets expensive.

 

"Service LTPWS


IIRC this mean "Low Tire Pressure Warning System".

 

If you take it a dealership they will rip you off, trust me most of us have been there. Check this out for testing the fuel system, you'll need a fuel pressure gauge too.

https://www.corvetteforum.com/techti...=192&TopicID=2

 

I have an 89 L98 auto and it ran rough and service light came on. It ended up being the ECM. I did not have any codes because the ECM was not communicating but the service light did come on when it ran rough. You could also smell the gas in the exhaust because it was running so rich. Good luck.

Kevin

 

thanks for everyones input. my tank was halfway empty today, so i filled it up with premium just to see if that might be the problem. It still stalled, but only twice and it ran way better than it had on the way to the gas station. tomorrow i'm planning on just driving down the highway for a while so i can use up more gas, and then filling it up again with premium. hopefully that was the problem all along and i can just edge it back to running on premium and running well.

god i hope that was the problem, and i hope using the regular didn't hurt the engine.

 

Toss a few cans of dri gas in the tank. May be moisture.