bobp@petfe.UUCP (Dan Masi) (11/13/85)
<<>> My car recently developed the following symptom: Under large load, the engine "cuts out". When I'm accelerating, or going up a steep hill, or any time that the accelerator is almost fully depressed, after a few seconds the car will lurch as though the ignition system was cut off for 1/4 second. If I back off of the accelerator, the problem stops; if I keep the pedal depressed, the engine will come back, then cut out again, then come back on, etc. This only seems to happen at speed, and only after the engine is heavily loaded for about 5 seconds (I can usually get through the first 2-3 gears flat out without this happening.) The car is 4 cylinder, turbocharged, throttle body fuel injection, electronic ignition (I think), 30,000 miles and 1.5 yrs old, if this helps. Does anyone have any ideas as to what could be going on here? Any hints would be greatly appreciated, as my car dealer is 30 miles away, expensive, and the mechanics blew the turbocharger while "test driving" the car the last time I brought it in for service! Thanks in advance, Dan Masi (201) 758-7127 ...!vax135!petsd!petfe!bobp
marauder@fluke.UUCP (Bill Landsborough) (11/14/85)
In article <558@petfe.UUCP> bobp@petfe.UUCP (Dan Masi) writes: > ><<>> >My car recently developed the following symptom: > >Under large load, the engine "cuts out". When I'm accelerating, >or going up a steep hill, or any time that the accelerator is almost >fully depressed, after a few seconds the car will lurch as though the >ignition system was cut off for 1/4 second. If I back off of the >accelerator, the problem stops; if I keep the pedal depressed, the engine >will come back, then cut out again, then come back on, etc. >Dan Masi (201) 758-7127 Your car is "running out of gas", not in the gas tank but in the carb or injection system. The reason it is running out of gas is usually a cheap fix; replace the fuel filter. If that doesn't do the trick then look to fuel pump or a blockage in the fuel line or in the float bowl but 90% of the time its the filter. Bill Landsborough
eric@amc.UUCP (Eric McRae) (11/14/85)
In article <558@petfe.UUCP> bobp@petfe.UUCP (Dan Masi) writes: >Under large load, the engine "cuts out". When I'm accelerating... >... if I keep the pedal depressed, the engine >will come back, then cut out again, then come back on, etc. I had a problem like this with a normally aspirated engine. The filter allowed enough fuel to cruise but as soon as I tried to pass, the engine almost died. To seperate a fuel problem from an ignition problem, grab a portable radio (AM or SW) and do whatever you have to do to pick up true ignition noise from your engine. If the radio gets quiet when your engine balks, then you have an electrical problem. I just remembered that you have a turbocharger. My turbo volvo has an overpressure cutout that kills the ignition system if the normal wastegate system fails and the manifold pressure hits 12psi. If your car has similar protection, you might suspect it. The overpressure switch could be monitored with an voltmeter.
thompson@apr.UUCP (The Software Warrior) (11/15/85)
> > My car recently developed the following symptom: > > Under large load, the engine "cuts out". When I'm accelerating, > or going up a steep hill, or any time that the accelerator is almost > fully depressed, after a few seconds the car will lurch as though the > ignition system was cut off for 1/4 second. If I back off of the > accelerator, the problem stops; if I keep the pedal depressed, the engine > will come back, then cut out again, then come back on, etc. > > This only seems to happen at speed, and only after the engine is heavily > loaded for about 5 seconds (I can usually get through the first 2-3 gears > flat out without this happening.) > > The car is 4 cylinder, turbocharged, throttle body fuel injection, > electronic ignition (I think), 30,000 miles and 1.5 yrs old, if this helps. > I saw this happen to a friends AUDI. The problem turned out to be a defective overboost detector on the turbo charger. When the gauge read about 1 and 1/2 bars the overboost detector would shut the car down for a second or so. You might want to check this and also your waste gate to make sure that it is functioning properly. I hope this helps. Ed +-------------------------------------------------------------------------+ | In Real Life : Edward D. Thompson | Just Visiting | | UUCP Address : ..cbosgd!apr!thompson | This Planet | | Compuserve Address : 75136,2024 +-------------------------+ | Postal Address : 2715 Tuller Parkway Drive, Dublin, Ohio 43017 | | Phone : (614) 766-6901 | +-------------------------------------------------------------------------+ * General Disclaimers, Trade Mark Recognitions, and anything else....... *
nelson@cvl.UUCP (Randal Nelson) (11/19/85)
In article <558@petfe.UUCP> bobp@petfe.UUCP (Dan Masi) writes: > ><<>> >My car recently developed the following symptom: > >Under large load, the engine "cuts out". When I'm accelerating, >or going up a steep hill, or any time that the accelerator is almost >fully depressed, after a few seconds the car will lurch as though the >ignition system was cut off for 1/4 second. If I back off of the >accelerator, the problem stops; if I keep the pedal depressed, the engine >will come back, then cut out again, then come back on, etc. Some time ago I had a similar problem with a 71 chevy van (350 V8 engine). The engine would cut out briefly under heavy loads and then recover. No one could figure out what the trouble was, and the problem persisted for several years, generally showing up on vacation when we were pulling a heavy load. It turned out that the symptom was due to vapor lock in the fuel line caused by high temperature around the engine which was in turn caused by lack of adequate air circulation due to a partially failed fan clutch. I don't know if this can happen with fuel injection, but you might check the cooling system to make sure that everything is working as it should. Randal Nelson