Mystery stall
#1
Mystery stall
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The car used to start and die about 4 seconds after but I jumpered the fuel pump socket and now it does this. There are no major vacuum leaks that I can find and. the car runs relatively normal as you can hear in the video after it gets good and running. I just don't understand why it's dying like this. I give it gas when it starts but when it stalls the throttle has no effect.
Any ideas?
The car used to start and die about 4 seconds after but I jumpered the fuel pump socket and now it does this. There are no major vacuum leaks that I can find and. the car runs relatively normal as you can hear in the video after it gets good and running. I just don't understand why it's dying like this. I give it gas when it starts but when it stalls the throttle has no effect.
Any ideas?
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#9
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i have the exact same problem on my SE, at first i thought it was the fuel filter or the ignition switch itself, but after swapping the filter and playing with some wiring i think the problem lays with either the TPS or ECU.
i always have a spare AFM that i swapped in, no change. weird....
i always have a spare AFM that i swapped in, no change. weird....
#12
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I have observed similar symptoms on my 86 when the BAC valve connector was disconnected. It would start and run for a couple of seconds, but when it tried to settle down to normal idle it would oscillate up and down and finally die.
Check that the BAC valve connector is connected; check the BAC valve per the FSM procedure (listen for a click when 12v applied); check the BAC valve control voltage per the FSM at the appropriate pin on the ECU.I
I thought I heard some backfiring in your video, which would suggest a too rich mixture. Very similar to what I observed, especially the inability to start it after the stall (sounds like its flooded).
Check that the BAC valve connector is connected; check the BAC valve per the FSM procedure (listen for a click when 12v applied); check the BAC valve control voltage per the FSM at the appropriate pin on the ECU.I
I thought I heard some backfiring in your video, which would suggest a too rich mixture. Very similar to what I observed, especially the inability to start it after the stall (sounds like its flooded).
Last edited by calpatriot; 03-24-10 at 12:20 AM.
#13
It's definitely not flooding. The plugs are dry and deflooding thoroughly has no effect on the starting. I know I have a massive vacuum leak at the injector(s) and I have no BAC valve. I also found that the thermo sensor plug behind the alternator was unplugged. I'm not sure if that could cause my problem.
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It's definitely not flooding. The plugs are dry and deflooding thoroughly has no effect on the starting. I know I have a massive vacuum leak at the injector(s) and I have no BAC valve. I also found that the thermo sensor plug behind the alternator was unplugged. I'm not sure if that could cause my problem.
The massive vacuum leak will cause it to run too lean, especially at idle, and die.
The disconnected water thermo valve will cause the ECU to believe the start is being conducted under extremely cold conditions; high (aka infininte) resistance of the water thermo sensor corresponds to low temps. The ECU richens the mixture to compensate for the low temps. This probably compensates for the lean condition created by the 'massive vacuum leak' above a certain rpm, and is insufficient enrichment to compensate for the leak at low rpm/high vacuum.
Fix the vacuum leak(s).
Connect the water thermo sensor, and check the voltage at the ECU per the FSM, see to it that it is within limits.
Replace the BAC valve, and hook it up.
Check the AWS air bypass solenoid, and make sure it is hooked up properly.
#18
Got the BAC valve connected and working. It idled for about 40 seconds then choked out. I think that if I get the AFM and the water temp in working order and get the injectors worked over it will fix my problem. I'll post another video when that stuff is finished.
#20
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Or listen to the pump. and make sure it keeps running with the car off, Since you have it jumped
Last edited by rx7_FREAKKK; 03-28-10 at 11:34 PM.
#21
Fuel pumps go out. Mine would run for 30-60 seconds then cut out when mine went. have someone in back with a voltage meter.. If the pump stops the voltage spikes. You would see if it was the fuel pump that is stalling out.
Or listen to the pump. and make sure it keeps running with the car off, Since you have it jumped
Or listen to the pump. and make sure it keeps running with the car off, Since you have it jumped
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