As someone pointed out in a private message, I should clarify that it is the vehicle in my signature. 16197427 pcm.
As someone pointed out in a private message, I should clarify that it is the vehicle in my signature. 16197427 pcm.
1994 Chevy G30 Van "Big Blue"
5.7 TBI, Vortec Heads, Summit Intake, Thorley Short Headers with dual 2.5" exhaust, 4L80E transmission
No ideas?
I've now replaced the distributor pickup coil. Same thing. Will idle for 5-10 seconds with the MAP sensor vacuum hose is disconnected. Starts and dies in uner a second if the MAP sensor is connected.
1994 Chevy G30 Van "Big Blue"
5.7 TBI, Vortec Heads, Summit Intake, Thorley Short Headers with dual 2.5" exhaust, 4L80E transmission
I guess I should have said that it uses the OE xdf.
Here is a log I took today. I alternated between starting it with the MAP hose connected and disconnected. You can see which is which because with it disconnected the MAP stays at 100 the whole time.
If you can look at the log and give ANY feedback at all it would be appreciated.
1994 Chevy G30 Van "Big Blue"
5.7 TBI, Vortec Heads, Summit Intake, Thorley Short Headers with dual 2.5" exhaust, 4L80E transmission
I had a similar issue when I built my setup but it sounds like your car was already running fine as is. My car had the map wires reversed. It was also doing strange things before I made the switch in the KPA rows. I also had a map sensor before that looked good but tested bad. Replaced it and that fixed the issue. How long have you ran it in closed loop? correct injector offsets? Is your battery dead again or low voltage?
are you running vehicle anti theft in the tune sounds a bit like its active.all the cars i deal with will start and die when vats is active
I think maybe it's the memcal. I'm looking for a known good one to try.
1994 Chevy G30 Van "Big Blue"
5.7 TBI, Vortec Heads, Summit Intake, Thorley Short Headers with dual 2.5" exhaust, 4L80E transmission
I have an unconventional and potentially dangerous way to help figure why the engine starts and dies.
I'd pour about 4 oz of fuel down the throttle body and start the engine and see how long the engine will run with the map sensor connected. If the engine keeps running for more than a second, I'd pour another 4 oz of fuel down the throttle body to keep the engine running. If the engine keeps running by being bottle feed fuel, I'd be thinking there is a fuel problem to figure out.
If the engine still starts and dies after being bottle feed fuel, I'd be thinking there is a spark or ignition problem.
Fuel is very flammable and potentially explosive, proceed at your own risk!
dave w
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