82 Corvette running problems
Melting Slicks
Joined: Mar 2006
Posts: 2,248
Likes: 67
From: Warrington PA
Finalist 2020 C4 of the Year - Unmodified
I filled the tank up with 5 gal, still acts like its not getting fuel. When I bought the car the guy removed the fuel tank and replaced the fuel pump and the hose and cleaned out the tank. With a flash light what I can see the tank looks clean. I have worked on a lot of cars just not familier with fuel injection or this car. I'm going to remove the fuel filter to see if it has plugged. Is there just the one under the car our is there another one hidden some where?
only 1 fuel filter under the RS front as you know. it would be a good idea to get a fuel pressure gauge and check your pressure at that junction, since you are going to replace the fuel filter. That way you can determine if it is fuel related or not......
Melting Slicks
Joined: Mar 2006
Posts: 2,248
Likes: 67
From: Warrington PA
Finalist 2020 C4 of the Year - Unmodified
as bpassmore stated: "it should look a fandango dancer's skirt with no drips" or looks like an open umbrella with a full spray pattern.
you also need to check for spark on your cylinders, since you feel that it is only running on half of the cylinders. I just use an old spark plug and insert into the boot and lean against metal, rather than wrap a towel around the the spark plug boot and hold it as someone cranks...did that in my early days....not fun....
of course if your not getting spark at different cylinders, then ignition is next.....go through the "sticky" and eliminate one-by-one....
Burning Brakes
Joined: Feb 2013
Posts: 1,062
Likes: 28
From: Burkburnett TX
As far as I know, the ecm controls the injectors. I do know for sure that my coolant temp sensor at the front of the intake was not right when I bought mine. It was telling the ecm it was cold, and ecm went full rich until I fixed it. The ecm uses a few inputs to determine how much fuel to command.
Melting Slicks
Joined: Jun 2011
Posts: 2,096
Likes: 15
Everything works in conjunction, TPS sensor determines the amount of fuel depending on throttle plate position. You still have everything else like Arkyvette said, coolant temp sensor, O2 whether it's in open or closed loop, IACs, ect. Then the ECM gets to un scramble the data .
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
The distributor actually signals both TB to fire through the ECM. You have one TB working so I would think the signal is there but I did have a 93 gmc distributor go and it only acted up at low rpm. That still doesn't explain why you're running on one TB. The signal fires off both at the same time.
I think if you get the Noid lights from harbor freight you can find out why that one TB doesn't fire.
Question; have you checked for fuel at the TB that's not working? Open up a line while the key is on and see if you get a drip....
I think if you get the Noid lights from harbor freight you can find out why that one TB doesn't fire.
Question; have you checked for fuel at the TB that's not working? Open up a line while the key is on and see if you get a drip....
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Melting Slicks
Joined: Mar 2006
Posts: 2,248
Likes: 67
From: Warrington PA
Finalist 2020 C4 of the Year - Unmodified
Yes, if you have a fuel spray at a TB, you are getting fuel. But that does not mean you are getting the proper fuel or spray at that TB.
Questions.....
1-what spray pattern are you getting at that 1 TB?
2-are you getting spray at both TB's, or only one?
3-have you completed any of the checks we have mentioned above?
spark, vacuum leaks, intake bolt tightness, fuel pressure, etc., etc.
It would be more beneficial to you to through the "sticky" and do one task at a time. You save more time by starting at a certain point (the beginning) and following through, rather then assuming that if something appears to work, then it is fine.
I know I sound like a broken record, but do one step at a time. That way you can tell us what your results are and we can then better assist you with your problem..............good luck..........Tom
Questions.....
1-what spray pattern are you getting at that 1 TB?
2-are you getting spray at both TB's, or only one?
3-have you completed any of the checks we have mentioned above?
spark, vacuum leaks, intake bolt tightness, fuel pressure, etc., etc.
It would be more beneficial to you to through the "sticky" and do one task at a time. You save more time by starting at a certain point (the beginning) and following through, rather then assuming that if something appears to work, then it is fine.
I know I sound like a broken record, but do one step at a time. That way you can tell us what your results are and we can then better assist you with your problem..............good luck..........Tom
Thread Starter
Intermediate
Joined: Jul 2013
Posts: 41
Likes: 0
Update:
Checked fuel pressure while turning engine over seems to be about 17 lb goes up some to 20 lbs
Checked signal to injectors with a Noid light tester both are getting signals.
Rotated distributor to see if that would help.
Acts like it wants to start but don't quite start. from working on cars acts like timing is off.
Fuel spray pattern looks good on both so with fuel pressure and the spray I'm looking at electrical signals or such.
Thanks all will be back later
Checked fuel pressure while turning engine over seems to be about 17 lb goes up some to 20 lbs
Checked signal to injectors with a Noid light tester both are getting signals.
Rotated distributor to see if that would help.
Acts like it wants to start but don't quite start. from working on cars acts like timing is off.
Fuel spray pattern looks good on both so with fuel pressure and the spray I'm looking at electrical signals or such.
Thanks all will be back later
Burning Brakes
Joined: Feb 2013
Posts: 1,062
Likes: 28
From: Burkburnett TX
Your plugs could be fouled if you haven't changed them recently and the fuel injectors are soaking them. Mine was that way when I bought it. Replacing them is cheap and not very hard, then verify spark and go from there. Also could be timing chain skipped...
Thread Starter
Intermediate
Joined: Jul 2013
Posts: 41
Likes: 0
I changed the plug when i got the car, there are no miles on them. I checked the spark from the Distributor and getting spark from all the cylinders. However I did change sparks plugs in a car years ago in a 66 Chevy with rebuilt motor could never get it to start. After spending three weeks checking on then putting it in the back yard I decided to put the old plugs in it and it started right up, so I might change those plugs again to see what happens. Question could alarm system affect this in anyway?
Racer
Joined: Sep 2009
Posts: 437
Likes: 3
From: Alvin Texas
Left side. When I first got my 82 ;no start, changed the plugs and it took off for several days then refused to start. Then discovered the ECM was defective, dumping too much fuel, it fouled the new plugs. Replaced the ECM and plugs, been going ever since.
Thread Starter
Intermediate
Joined: Jul 2013
Posts: 41
Likes: 0
OK update. After suggesting changing plugs and remembering I had this happen before I went down and got a new set of plugs and changed them out. What do you know it now started. Still don't idle but runs at 2000 RPM or higher nice and smooth. Does seem to run rich,real rich. I unplugged the EGR and ran it straight to the TB seemed to be better but still running rich. Where the EGR plugs in on vacuum I noticed it was broke where it plugged in, that's why I went to the TB to see what happened. I can hold the throttle to where it is almost idling but went I let off it will die. so still got more work.
Melting Slicks
Joined: Jun 2011
Posts: 2,096
Likes: 15
Update:
Checked fuel pressure while turning engine over seems to be about 17 lb goes up some to 20 lbs
Checked signal to injectors with a Noid light tester both are getting signals.
Rotated distributor to see if that would help.
Acts like it wants to start but don't quite start. from working on cars acts like timing is off.
Fuel spray pattern looks good on both so with fuel pressure and the spray I'm looking at electrical signals or such.
Thanks all will be back later
Checked fuel pressure while turning engine over seems to be about 17 lb goes up some to 20 lbs
Checked signal to injectors with a Noid light tester both are getting signals.
Rotated distributor to see if that would help.
Acts like it wants to start but don't quite start. from working on cars acts like timing is off.
Fuel spray pattern looks good on both so with fuel pressure and the spray I'm looking at electrical signals or such.
Thanks all will be back later
Melting Slicks
Joined: Mar 2006
Posts: 2,248
Likes: 67
From: Warrington PA
Finalist 2020 C4 of the Year - Unmodified
Glad you are running......I would check , reset your timing, and as
"bpassmore" mentioned, your ECM may be defective....
at least progress is being made!!! Tom
"bpassmore" mentioned, your ECM may be defective....
at least progress is being made!!!
Tom