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Old 03-25-2012, 09:25 AM   #15
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I agree and I think the problem might be the battery isolator relay. When I cleaned the ground strap to the relay is when it started. It then quit again. That is a cheap fix so we will try that.
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Old 03-25-2012, 10:13 AM   #16
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try the ign switch I sat on the side of the road twice with that problem.
Then carried a spare
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Old 04-15-2012, 06:25 PM   #17
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Ok an update. Found fuse block was not getting power from the ignition. Could not find the fuselink in the wire so we ran a new wire and it started right up and ran great. We started it and ran it at least 10 times with no problems. Went to start it again and it started and died immediately. When we tried starting it it seems to backfire through the throttle body.

Checked and or replaced the following:

Fuel Filter: Clean
Fuel pump: running
Fuel to injectors: Yes, spraying on start up then engine dies
MAP sensor had bad top so we replaced

Tomorrow we will do fuel pressure test

What else should I check?
Something is shutting down the engine
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Old 04-15-2012, 09:38 PM   #18
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Question

On your unit is there a low oil pressure switch??.
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Old 04-15-2012, 09:46 PM   #19
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The problem I had was the switch on the pannel too many other things on the chain and the switch quit working ,the engine would spin over but not start or run for a few bumbs and then quit $18 at NAPA a paper clip to change the lock and we were on the way if you have the same problem a new switch and a bladed screwdriver will get you downn the road
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Old 04-16-2012, 12:10 AM   #20
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We replaced the oil sending sensor also and it is showing plenty of oil pressure
We also replaced the ignition switch.
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Old 04-16-2012, 06:04 AM   #21
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Certainly a fuel pressure check is going to be telling if that is the problem.While doing that,run a spark checker on the coil wire.
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Old 04-16-2012, 09:09 AM   #22
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Thanks what about pickup coil in distributor or could the TPS shut it down?
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Old 04-16-2012, 10:48 AM   #23
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I think pick up coils have been found to be bad in it's self.Cold coils can generate spark,but once they warm up,break down.
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Old 04-19-2012, 07:17 PM   #24
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Just about out of ideas- fuel pressure OK. Had ignition module tested OK. I am putting on a new TPS and see if that could be the problem. It starts and the injectors are spraying when it shuts down.
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Old 04-23-2012, 08:49 AM   #25
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Is there a "cold start" sensor on it? Takes the place of a choke.
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Old 04-24-2012, 08:14 AM   #26
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Not that I can see. The ECM is supposed to take care of that.
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Old 04-24-2012, 08:30 AM   #27
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Well yes the ECM will take care of it but only when a sensor tells the ECM that it's cold and to use the cold start circuit. It might be the water temp sensor/air temp. Some were there is a sensor.
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Old 04-24-2012, 10:42 AM   #28
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ECM monitors water temp and runs in open loop mode until engine warms up and then transitions to closed loop mode. ECM sets the AFR richer in open loop mode. Here is a description for a mulitpoint EFI however the principles would be the same for a TBI based system:
Free Resource For Embedded Holic: Multipoint - EFI System (Part10. OPEN AND CLOSED LOOP)

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