stalling 94. (on freeway)
Thread Starter
5th Gear
Joined: Mar 2007
Posts: 5
Likes: 0
From: Bonney Lake Wa.
stalling 94. (on freeway)
my 94 stalled on me again last night on my way home from work. It ran great on my way in. about half way home it just died. i was at a steady 63 mi hr. in fifth gear. i waited about 5 minutes and she started right up. it did this once before. I changed the fuel pump about a month ago. Any suggestions would be greatly appreceated. the car has 144000 miles on it. please forgive any misspells. i cant download spell check on this comp.
Last edited by OL'1BALL; Mar 23, 2008 at 06:51 PM.
Instructor
Joined: Apr 2006
Posts: 225
Likes: 0
From: Port Aransas TX
I've had plugged CATs do that to me before. I've also had fuel delivery problems cause that. It's hard to say without any specific symptoms. It could also be an intermittent electrical gremlin. I had an Olds Aurora that would suddenly quit working for no apparent reason. I never found the problem, though I suspected it to be elecrical.
Larry
Larry
Thread Starter
5th Gear
Joined: Mar 2007
Posts: 5
Likes: 0
From: Bonney Lake Wa.
Thanks for the reply. I'm getting my plan of attack together now. my plan now is to change the fuel pump relay & filter. i am a fairley new vett owner. iv owened this car for 2 years and it's been trouble free till recently. i am going to hook up my fuel press. gauge to check that as well. I was hoping someone had similar issues with theirs. i don't want to shotgun this problem. If i find the smoking gun i will be sure to post my findings. Thanks to all. Roger...
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
I doubt it is your fuel pump relay there are 2 anyway (main and oil pressure)redundant. What is your fuel pressure at the rail? You need a FSM to trouble shoot an intermitant stall condition there are so many things it could be. It may very well be your ICM when they get ready to die the heat soak makes them fail intermittantly. Or it could be the coil. You are not supplying enough info to make a call.
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
The 5 minutes and start thing is the kicker.
Do a fuel pressure guage and tape it to the windshield first to see what is happening before you start replacing relays. The filter is cheap and would be done anyway.
It sounds like the cat is plugging you up. Could be tired or you could be running rich enough to cause it to plug. I am no expert so I will throw this out and let the experts chime in
Do a fuel pressure guage and tape it to the windshield first to see what is happening before you start replacing relays. The filter is cheap and would be done anyway.
It sounds like the cat is plugging you up. Could be tired or you could be running rich enough to cause it to plug. I am no expert so I will throw this out and let the experts chime in
Advanced
Joined: Jul 2007
Posts: 89
Likes: 0
My friends 93 had a faulty ecm. When it ran for about five minutes it would die you let it sit for about ten minutes and it would run fine for about an hour then die again. You would begin the cat and mouse chase all over again. The electronics were faulty. If you have that problem diagnostics won't tell you squat it becomes a thing of understanding electronics and knowing that the sensors are feeding the ecm the proper signals.
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Race Director
Joined: Nov 2000
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From: stop the fun suckers
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
The 5 minutes and start thing is the kicker.
Do a fuel pressure guage and tape it to the windshield first to see what is happening before you start replacing relays. The filter is cheap and would be done anyway.
It sounds like the cat is plugging you up. Could be tired or you could be running rich enough to cause it to plug. I am no expert so I will throw this out and let the experts chime in
Do a fuel pressure guage and tape it to the windshield first to see what is happening before you start replacing relays. The filter is cheap and would be done anyway.
It sounds like the cat is plugging you up. Could be tired or you could be running rich enough to cause it to plug. I am no expert so I will throw this out and let the experts chime in
My thought is that one clogged cat would not cause the engine to completely quit, run real bad is what I would expect.
My friends 93 had a faulty ecm. When it ran for about five minutes it would die you let it sit for about ten minutes and it would run fine for about an hour then die again. You would begin the cat and mouse chase all over again. The electronics were faulty. If you have that problem diagnostics won't tell you squat it becomes a thing of understanding electronics and knowing that the sensors are feeding the ecm the proper signals.
There are a lot of problems with the ECMs like as the one you described. However this is a 94 with a PCM. Performs same basic functions but is a whole different animal. The PCMs are much more reliable and don’t cause all those problems the ECMs cause. The PCM would be almost the last thing I would look at.
You can always look for a code but I’ll bet you won’t find any. If the fuel turns out not to be the problem, then I would focus on the ICM first, and the coil second. The ICM is a solid state amplifier and is more prone to krap out from heat.
Instructor
Joined: Dec 2006
Posts: 125
Likes: 0
From: Kemah Texas
I know this sounds crazy but I backed it up with test... I had the same problem with my 92 LT1.. Cutting out after warm-up and restarting 5 min after sitting... Made it home last time it happened and let it idle in driveway while looking for problem... After three cycles of fan on at 228, off at 217 engine would die, fuel pressure remained at 39/41, no codes... Happened to noticed steam coming from around the raditor cap, checked cap and it was bad... Replaced cap and no-more cutting out... Figured fix couldn't be this easy!!! Ok, placed bad cap back on tank and after the three cycles, engine cutting out started again... New cap back on and it hasn't missed or cut out... I know it sounds crazy and beats any reason to explain, but its been running great now for 3 months... I still have the bad cap and intend to try the test again soon... 2 cents worth...
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
Don’t think any one has forgot about the opti. Its just not a classic symptom for it to just quit and come back. A cap&rotor would not do it, usually causes poor running. And if the low resolution pulse dropped out from the optical pickup, it should throw a code 16 and light up the SES lamp (service engine soon). That would definitely kill the engine.
Was this a one time occurance?