1993 Engine Running Rough and No Power
1993 LT1, 6 speed manual. No engine mods other than K and N Filter.
112K miles. Regular maintenance, never abused. Started and drove great one day. Started it up an hour later and was running rough. Shifted into 1st gear and car would almost stall as I let out the clutch before I could get it to move. That's as far as I got driving it for fear of it quitting on me somewhere other than my driveway. Waited a couple days and tried again, same symptoms. Plugs/wires done w/in the past year. New opti less than 60 days ago. New fuel pump/filter about 5 years ago. My mechanic suggested a fuel starvation problem attributing it to a small piece of hose in the tank between the pump and the fuel line that will deteriorate and fuel will escape thru holes/cracks. There was also a very low, but noticeable whine coming from the rear of the car for a few days before this happened. The whine was not movement related...sometimes would make the noise, even when the car was stopped. Like I said, was running as strong and smoothly as it ever had after the new opti. |
I think you might trust the mechanic on this but to save time/money put a pressure gage on and see how much fuel pressure you have. With the whine you had in the back it sure could be the pump.
|
Concur, that was the 1st thing I was going to check.
Off the top of your head, how hard is to change a fuel pump in a C4? Do you have to drop the tank or is the pump accessable some other way? |
Originally Posted by 73737373
(Post 1581356110)
Concur, that was the 1st thing I was going to check.
Off the top of your head, how hard is to change a fuel pump in a C4? Do you have to drop the tank or is the pump accessable some other way? |
That's what the mechanic said, but he wasn't certain. Hey, this may be easier than I 1st thought. Wouldn't that be a novelty on a Corvette?
|
Originally Posted by 73737373
(Post 1581356564)
That's what the mechanic said, but he wasn't certain. Hey, this may be easier than I 1st thought. Wouldn't that be a novelty on a Corvette?
|
And they're only about $50, too. This is almost too good to be true. Watch...my fuel pump will be fine. It will some other PITA repair that needs to be done.
|
The Fuel pump can be changed from the top. Not the most enjoyable job in the world, but not too too bad. As others said - check the fuel pressure with the car running first.
With a whine from the back being noticed - I'd think fuel pump pressure first, but Remember - just becuase the opti is quite new - doesn't mean it isn't bad. |
I went ahead and replaced the fuel pump, if for no other reason than to get rid of the whine and hoping it would solve my problem. It did not...exact same symptoms as before.
I'll check the filter. |
I haven't heard a 90's GM fuel pump that DOESN'T whine. That is normal for them.
Since it presents the symptoms easily. Your going to have to diagnose the issue or just keep throwing parts at it. Let it idle (if it will). Check spark with spark tester at plugs and off the coil wire. I like inline checkers. Check the following: Fuel Pressure Injectors (feel for firing on all) Start with that. No codes I assume? Scan the ECM for data and see if it is within specs. if possible. |
Thanks.
|
For the cost of that fuel pump and a few more dollars you can get a shop manual that will have all kinds of trouble shooting diagnostic tests you can perform to determine the problem. If this thread goes like so many others you will be told to replace the opti, fuel injectors, plugs, wires, fuel filter, fuel pump, fuel pressure regulator, catalytic converter, fuel cap, ECM, wiper blades and sprinkle Rhode Island Red chicken blood on the starter. That money will buy a dozen manuals.
|
I have one. Maybe a good idea if I opened it and read it.
|
All times are GMT -4. The time now is 09:21 PM. |
© 2024 MH Sub I, LLC dba Internet Brands