Help needed! Could faulty coil cause this??
Thread Starter
Instructor
Joined: Aug 2001
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From: Finland
Help needed! Could faulty coil cause this??
Just couple of days ago i got my injectors cleaned. At the same time I cleaned runners, Plenum and throttle body. I also ported the plenum. I also intalled new IAC, Egr valve and 180 degree thermostat. All gaskets are new also.
Now my car starts up like a rocket no matter if the engine is warm or cold. My injectors were in pretty crappy condition. A new problem has surfaced however.
Car starts fine but it almost immediately dies. I have to do this 3-4 times before it keeps running. This morning when I was going to work the car just died?! I mean power was on and all that but pressing the pedal would have no effect what so ever. It just rolled along with its momentum. Just when I was going to pull it side of the road it got spark and started to run normally. So weird. Could faulty coil be causing these symptoms?? I have changed plugs, wires, cap, rotor this summer.
Thanks
1988 vette
Now my car starts up like a rocket no matter if the engine is warm or cold. My injectors were in pretty crappy condition. A new problem has surfaced however.
Car starts fine but it almost immediately dies. I have to do this 3-4 times before it keeps running. This morning when I was going to work the car just died?! I mean power was on and all that but pressing the pedal would have no effect what so ever. It just rolled along with its momentum. Just when I was going to pull it side of the road it got spark and started to run normally. So weird. Could faulty coil be causing these symptoms?? I have changed plugs, wires, cap, rotor this summer.
Thanks
1988 vette
Safety Car
Joined: Feb 2002
Posts: 4,212
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From: Sun City West Az
Re: Help needed! Could faulty coil cause this?? (Aaron71771)
Did it stall while in idle or while you were driving along? Could be a faulty coil, or maybe a fuel pump??
Thread Starter
Instructor
Joined: Aug 2001
Posts: 217
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From: Finland
Re: Help needed! Could faulty coil cause this?? (ittlfly)
Fuel filter has been changed this summer. It stalls usually right after it has started. Usually in the first start up in the morning. But not always thou..
This morning it did stall when I was driving 40 mph. Yesterday it stalled when I was accelerating WOT on the freeway. Correct me if I'm wrong, but if it would be the fuel pump, shouldn't it stutter and sputter and not just die in the middle of drive?? My bet is on the coil.
This morning it did stall when I was driving 40 mph. Yesterday it stalled when I was accelerating WOT on the freeway. Correct me if I'm wrong, but if it would be the fuel pump, shouldn't it stutter and sputter and not just die in the middle of drive?? My bet is on the coil.
Racer
Joined: May 2001
Posts: 407
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From: San Antonio TX
Re: Help needed! Could faulty coil cause this?? (jutammel)
I will assume you adjusted your TPS and idle after all that work. If not, you should (see tech tips). You did a lot of work up top. Did you check your fuel pump relay? I know my 87s relay connector had about 1/2 inches of bare wire that under certain conditions would short and cause the engine to stop. Does the dash and other electronics stay on, and the engine just dies like you disconnected fuel/coil? I have heard of coils going out, but it seems strange that it comes back fine for long periods, then dies completely again. I'd give the bad coil theory lower odds than a connection problem somewhere.
Pro
Joined: Sep 2003
Posts: 670
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From: charlotte nc
Re: Help needed! Could faulty coil cause this?? (jutammel)
I don't think it's the coil. Usually , if a coil is going bad, it will be hard to start when the engin is hot and if it were to quit while running, tha car would not start until the coil cooled down. Sounds to me like you idle adjustment or tps setting is off. :cheers:
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Thread Starter
Instructor
Joined: Aug 2001
Posts: 217
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From: Finland
Re: Help needed! Could faulty coil cause this?? (dwestsr)
Hmm.. now that I think of I didn't adjust my idle or TPS sensor after all what i had done. I'm going check those immediately! Maybe I should check the timing also.
Thread Starter
Instructor
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From: Finland
Re: Help needed! Could faulty coil cause this?? (Topless87)
[ Does the dash and other electronics stay on, and the engine just dies like you disconnected fuel/coil? ]
Dash and electronics stay on. The engine just... dies, like disconnected coil. That's why I suspected coil damage. But I will check my idle and TPS first.
Dash and electronics stay on. The engine just... dies, like disconnected coil. That's why I suspected coil damage. But I will check my idle and TPS first.
Navigator
Joined: Feb 2003
Posts: 9
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From: Snellville GA
Re: Help needed! Could faulty coil cause this?? (jutammel)
I'm thinking fuel pump. In my experience, the symptoms mirror what you're experiencing, i.e. engine cuts out without any warning or sputtering. If that turns out to be the problem, I would use AC Delco pump and sock to replace. It's a pretty straightforward job.
