1990 wont hardly run
Thread Starter
Instructor
Joined: Dec 2011
Posts: 146
Likes: 1
From: Kenton Ohio
1990 wont hardly run
Well it ran fine on the way to work then on the way home it stalled nd wouldn't start unless i had it at half throttle.
Once it started it was smoking black bad anymore than half or less it wouldnt run, i pulled the codes and it was 41 and 45.
says cam sensor or electronic spark timing circit open or shorted.
So where is the cam sensor located in the distributor? or is it just a bad distributor?
Once it started it was smoking black bad anymore than half or less it wouldnt run, i pulled the codes and it was 41 and 45.
says cam sensor or electronic spark timing circit open or shorted.
So where is the cam sensor located in the distributor? or is it just a bad distributor?
Thread Starter
Instructor
Joined: Dec 2011
Posts: 146
Likes: 1
From: Kenton Ohio
ok fuel injectors dont have enough power to turn on, they turn on but too low to start. is there something in the distributor that controlds the voltage to injectors?
Last edited by Sam5828; Apr 25, 2012 at 06:47 PM.
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
Did you check the FPR for a ruptured diaphragm as C409 advised? If no fuel in the vacuum hose the FPR should be ok.
Still using the stock multi tech injectors? If so they are suspect as they tend to short out. The 90 is batch fire, one malfunctioning injector can effect the operation of the others. Ohm test the injectors engine cold & engine hot.
GL
Still using the stock multi tech injectors? If so they are suspect as they tend to short out. The 90 is batch fire, one malfunctioning injector can effect the operation of the others. Ohm test the injectors engine cold & engine hot.
GL
Thread Starter
Instructor
Joined: Dec 2011
Posts: 146
Likes: 1
From: Kenton Ohio
Did you check the FPR for a ruptured diaphragm as C409 advised? If no fuel in the vacuum hose the FPR should be ok.
Still using the stock multi tech injectors? If so they are suspect as they tend to short out. The 90 is batch fire, one malfunctioning injector can effect the operation of the others. Ohm test the injectors engine cold & engine hot.
GL
Still using the stock multi tech injectors? If so they are suspect as they tend to short out. The 90 is batch fire, one malfunctioning injector can effect the operation of the others. Ohm test the injectors engine cold & engine hot.
GL
Suckin' gas, haulin' ass.
Joined: Apr 2010
Posts: 1,100
Likes: 8
From: Newport News Virginia
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Since you have 65psi at the rail I assume the engine is "built" to take that much pressure???
That black smoke sounds like way too much fuel; is there fuel smell in the FRP vac line?
That black smoke sounds like way too much fuel; is there fuel smell in the FRP vac line?
Thread Starter
Instructor
Joined: Dec 2011
Posts: 146
Likes: 1
From: Kenton Ohio
I didnt know it had that much till tested it. It is stock all but pcmfor less chip. Like I said it has been running fine just acted up on the way home from work and started the black smoke and would only run on half throttle no more and no less. And will not start now.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Remove the vacuum line from the fuel pressure regulator and turn on the key. If fuel comes out of the FPR then the diaphragm is ruptured. It will send fuel into the plenum and cause nasty stuff to happen (mine caught on fire).
Thread Starter
Instructor
Joined: Dec 2011
Posts: 146
Likes: 1
From: Kenton Ohio
Thread Starter
Instructor
Joined: Dec 2011
Posts: 146
Likes: 1
From: Kenton Ohio
When i turn the key over and check voltage at injector plug it is 0 but when i turn the key it is .5 volts. shouldnt it have 12 volts with the key on?
Could it be a 02 sensor since it was rich before it died completely.
Pick up coil check out at 800 ohm
has new cap, rotor, Ign control module
could it be the ECM? If so how can i check it?
each injector was 14 ohm
bypassed oil pressure switch
checked tps and it was good
Could it be a 02 sensor since it was rich before it died completely.
Pick up coil check out at 800 ohm
has new cap, rotor, Ign control module
could it be the ECM? If so how can i check it?
each injector was 14 ohm
bypassed oil pressure switch
checked tps and it was good
Last edited by Sam5828; Apr 27, 2012 at 02:57 PM.
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
It probably will not restart due to fouled spark plugs.
You have to much fuel pressure. Either the fuel return line to the tank is plugged/kinked or the FPR is not functioning properly.
Check the motor oil for fuel contamination.
GL
You have to much fuel pressure. Either the fuel return line to the tank is plugged/kinked or the FPR is not functioning properly.
Check the motor oil for fuel contamination.
GL
Thread Starter
Instructor
Joined: Dec 2011
Posts: 146
Likes: 1
From: Kenton Ohio
The injectors do not have enough voltage to turn on. They are .5 volts at cranking and 0 at key on.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
Check the EGR valve to make sure it is not stuck open or leaking. See if it moves smooth.
Check out and look for any broken vacuum fitting or line.
Check out the IAC, might be stuck. It might cause similar symptoms.
I was also thinking TPS was that is probably a stretch.
Check out and look for any broken vacuum fitting or line.
Check out the IAC, might be stuck. It might cause similar symptoms.
I was also thinking TPS was that is probably a stretch.
Thread Starter
Instructor
Joined: Dec 2011
Posts: 146
Likes: 1
From: Kenton Ohio
OK a update.
We got it running changed all the plugs and it fired up not great but it did, drove it for a little bit and seem to get better. But had it running for about 10 sec at first checked all the sensors on scan tool and the MAT sensor was reading 176* there is no way it could of been that hot car only ran 10 sec. But after we took it for a drive it went down to about 120*. So just wondering if this is bad also.
Next thing Alternator ony is reading 13 v down to 12 V. so im hoping it just got too lolw and screwed everything up and caused this mess. What do you all think?
Also one other thing my distance to empty and average mileage isnt working, DTE shows 0 and AM is showing 69
We got it running changed all the plugs and it fired up not great but it did, drove it for a little bit and seem to get better. But had it running for about 10 sec at first checked all the sensors on scan tool and the MAT sensor was reading 176* there is no way it could of been that hot car only ran 10 sec. But after we took it for a drive it went down to about 120*. So just wondering if this is bad also.
Next thing Alternator ony is reading 13 v down to 12 V. so im hoping it just got too lolw and screwed everything up and caused this mess. What do you all think?
Also one other thing my distance to empty and average mileage isnt working, DTE shows 0 and AM is showing 69
Last edited by Sam5828; Apr 30, 2012 at 09:08 PM.
