91 no start after 2 years storage (update)
Thread Starter
Racer
Joined: Apr 2004
Posts: 378
Likes: 1
From: Fremont NH
Of course, it gets worse LOL...
I just ohm'd the injectors..
Drivers side front to rear are 16.0 16.1 16.1 15.9
Pass side front to rear is 16.1 16.1 16.0 00.5
I so didn't want to have to replace them..
I'm assuming one dead injector will not shut the whole system down so I'll still be dealing with a no start condition once I replace the injectors
Did check the fuses.. they are fine. 12V on each side, I pulled them and checked for continuity too for the heck of it.
I just ohm'd the injectors..
Drivers side front to rear are 16.0 16.1 16.1 15.9
Pass side front to rear is 16.1 16.1 16.0 00.5
I so didn't want to have to replace them..
I'm assuming one dead injector will not shut the whole system down so I'll still be dealing with a no start condition once I replace the injectors
Did check the fuses.. they are fine. 12V on each side, I pulled them and checked for continuity too for the heck of it.
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
Of course, it gets worse LOL...
I just ohm'd the injectors..
Drivers side front to rear are 16.0 16.1 16.1 15.9
Pass side front to rear is 16.1 16.1 16.0 00.5
I so didn't want to have to replace them..
I'm assuming one dead injector will not shut the whole system down so I'll still be dealing with a no start condition once I replace the injectors
Did check the fuses.. they are fine. 12V on each side, I pulled them and checked for continuity too for the heck of it.
I just ohm'd the injectors..
Drivers side front to rear are 16.0 16.1 16.1 15.9
Pass side front to rear is 16.1 16.1 16.0 00.5
I so didn't want to have to replace them..
I'm assuming one dead injector will not shut the whole system down so I'll still be dealing with a no start condition once I replace the injectors
Did check the fuses.. they are fine. 12V on each side, I pulled them and checked for continuity too for the heck of it.
Thread Starter
Racer
Joined: Apr 2004
Posts: 378
Likes: 1
From: Fremont NH
Oh? Well that would be better..
Still stinks I have to pull the upper off but if it is a 'most likely' will run when back together scenario I'm OK with that ~
Time to call Mr. Banner~
Joe, just want to say I appreciate all the input you've had to this thread.
Still stinks I have to pull the upper off but if it is a 'most likely' will run when back together scenario I'm OK with that ~
Time to call Mr. Banner~
Joe, just want to say I appreciate all the input you've had to this thread.
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
joe
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
You've already answered your questions with dropping fuel pressure, intermitent starts, etc.
Bad fuel pump and injectors. Sitting that long and with that much water in the fuel system is a killer. '90/'91 Multecs are notorious for failure under normal circumstances, much less the extremes yours have been exposed to.
Bad fuel pump and injectors. Sitting that long and with that much water in the fuel system is a killer. '90/'91 Multecs are notorious for failure under normal circumstances, much less the extremes yours have been exposed to.
Thread Starter
Racer
Joined: Apr 2004
Posts: 378
Likes: 1
From: Fremont NH
Just got off the phone with Jon..
He had me unplug just the injector that was at 00.5 and try to start the car..
Fired right up and idles by itself. Granted, its running rough, but I was able to drive it around the yard with no problem
I'm ordering a set of Bosch injectors and a gasket set..
Looks like I'll have something fun to do Saturday~
He had me unplug just the injector that was at 00.5 and try to start the car..
Fired right up and idles by itself. Granted, its running rough, but I was able to drive it around the yard with no problem
I'm ordering a set of Bosch injectors and a gasket set..
Looks like I'll have something fun to do Saturday~
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
Just got off the phone with Jon..
He had me unplug just the injector that was at 00.5 and try to start the car..
Fired right up and idles by itself. Granted, its running rough, but I was able to drive it around the yard with no problem
I'm ordering a set of Bosch injectors and a gasket set..
Looks like I'll have something fun to do Saturday~
He had me unplug just the injector that was at 00.5 and try to start the car..
Fired right up and idles by itself. Granted, its running rough, but I was able to drive it around the yard with no problem
I'm ordering a set of Bosch injectors and a gasket set..
Looks like I'll have something fun to do Saturday~
yes, I understand water in fuel. but to jump from "water in tank" for 2 yrs, to water in fuel rails, is a leap in logic. the water is -what? 15 feet away?
fsm says 37-42 lbs fuel pressure is normal, and is normal for it to drop as soon as fp is off.
either way, the pressure did not explain a 2 sec run time.
curiously, fsm does not mention that a shorted inj will shut down the signal. I got that from guys on this forum and "boomdriver," corvetteactioncenter. it does say that no tach during crank means no pulses. just some info for the next thread....
saludos, joe
** I recall cusinartvette saying to ohm the injectors, days ago!
Last edited by joe paco; Aug 2, 2011 at 02:14 PM. Reason: add, as usual**
Thread Starter
Racer
Joined: Apr 2004
Posts: 378
Likes: 1
From: Fremont NH
I'm a very literal guy LOL..
He specifically said "Try getting the ohms reading on the injectors if you can get the motor warm."
I couldn't even get it to run, never mind warm up
At that point I was still wondering about fuel pressure and hadn't tested it yet~
That said, point taken.. Would've saved some amount of effort to check that sooner.
He specifically said "Try getting the ohms reading on the injectors if you can get the motor warm."
I couldn't even get it to run, never mind warm up
At that point I was still wondering about fuel pressure and hadn't tested it yet~
That said, point taken.. Would've saved some amount of effort to check that sooner.
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Burning Brakes
Joined: Feb 2001
Posts: 769
Likes: 0
From: Granbury TX
I have a 91 coupe and am experiencing very simular problems. But my story is way different.
My car was running fine. Driven daily. The fuel level indication stoped working and so I pulled the fuel tank sending/pump assembly and found the level unit broken. I was lucky enough to find a complete spout/sending unit/fuel pump. A NOS GM part, new in the box.
After installing the new fuel assembly in the tank, my car wouldn't start. From there on the symptons sound just like yours. I have since had some moments where the car started and ran just fine but then moments later would not start again, or start but sputter and die. I tried switching back to the original fuep pump assembly, but the problem presisted.
I suspect a loose connection somewhere in the circuit through the ECM and/or the CCM. A very diffacult problem to find.
Do you see any evidence of water intrusion or corrosion around the ECM connections on yoour car?
My car was running fine. Driven daily. The fuel level indication stoped working and so I pulled the fuel tank sending/pump assembly and found the level unit broken. I was lucky enough to find a complete spout/sending unit/fuel pump. A NOS GM part, new in the box.
After installing the new fuel assembly in the tank, my car wouldn't start. From there on the symptons sound just like yours. I have since had some moments where the car started and ran just fine but then moments later would not start again, or start but sputter and die. I tried switching back to the original fuep pump assembly, but the problem presisted.
I suspect a loose connection somewhere in the circuit through the ECM and/or the CCM. A very diffacult problem to find.
Do you see any evidence of water intrusion or corrosion around the ECM connections on yoour car?
Last edited by Strike3; Aug 3, 2011 at 02:33 PM.
Pro
Joined: May 2006
Posts: 637
Likes: 0
Strike3, have you ohm tested your injectors since this happened?
How much/little fuel in the tank?
Driven daily, so it may not apply to you, but it´s not good to let the tank almost run empty because of possible fuel pump overheating.
I don´t let it go under 5 gallons or so before filling up to full again.
Don´t rely on the fuel gauge but use your trip meter instead.
If you zero it every time you fill up, you can´t go wrong.
Drive up to 350 miles max. and fill up again...
If your milage is in the normal range of course, say 22-23 mpg.
How much/little fuel in the tank?
Driven daily, so it may not apply to you, but it´s not good to let the tank almost run empty because of possible fuel pump overheating.
I don´t let it go under 5 gallons or so before filling up to full again.
Don´t rely on the fuel gauge but use your trip meter instead.
If you zero it every time you fill up, you can´t go wrong.
Drive up to 350 miles max. and fill up again...
If your milage is in the normal range of course, say 22-23 mpg.
Thread Starter
Racer
Joined: Apr 2004
Posts: 378
Likes: 1
From: Fremont NH
Just in case anyone is interested in the final outcome...
I got a set of Bosch 3's from Jon and put them in today..
Took about 3 hours from start to finish (20 minutes of that was trying to retrieve one of the runner bolts I dropped down behind the motor)
End result.. Started right up, idles smoothly. After it ran for 10 or 15 minutes I took it around the block. Great throttle response, spins 'em like crazy off the line and the car is running fantastic.
I had forgotten how 'fun' it is to tear down the L98 upper intake.. good grief those 2 runner bolts you get from the opposite side stink LOL..
At least I can rest easy now that the fuel system is cleaned out and the injectors should cause me no grief from now on~
Thanks again to those who had input.. and especially to Jon for the excellent service both in diagnostics and product~
Kev
I got a set of Bosch 3's from Jon and put them in today..
Took about 3 hours from start to finish (20 minutes of that was trying to retrieve one of the runner bolts I dropped down behind the motor
)End result.. Started right up, idles smoothly. After it ran for 10 or 15 minutes I took it around the block. Great throttle response, spins 'em like crazy off the line and the car is running fantastic.
I had forgotten how 'fun' it is to tear down the L98 upper intake.. good grief those 2 runner bolts you get from the opposite side stink LOL..
At least I can rest easy now that the fuel system is cleaned out and the injectors should cause me no grief from now on~
Thanks again to those who had input.. and especially to Jon for the excellent service both in diagnostics and product~
Kev