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1990 w150 stalling and struggling to restart

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Old Nov 12, 2025 | 12:16 PM
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Ok, rethinking this... there are no codes for egr, ignore that part. Check the wiring for the O2 sensor, if the wiring is good, replace the sensor.
 
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Old Nov 12, 2025 | 12:26 PM
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lol sounds a bit simpler too, I'll go find a continuity tester and visual check to see and be back asap
 
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Old Nov 13, 2025 | 03:01 PM
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Checked the wires, they all seem fine, wire casings show no signs and I dont think any even really had oil on em. Was thinking about it and wouldnt a o2 sensor throw a check engine light?
 
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Old Nov 13, 2025 | 03:08 PM
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Originally Posted by LostnConfused
Checked the wires, they all seem fine, wire casings show no signs and I dont think any even really had oil on em. Was thinking about it and wouldnt a o2 sensor throw a check engine light?
O2's have a variety of failure modes that the PCM simply doesn't know it's getting bad data..... On OBDII systems, the rear O2 will also monitor, so, you get some checks and balances.... but, that's not till 96....

O2 has nothing to do with starting though.... Do you get the same behavior on both fuels?
 
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Old Nov 13, 2025 | 03:12 PM
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Haven't tried on propane as I havent been able to get refilled since I bought it due to it not being inspected. But I know it stalled with both fuels but back then itd start right back up.
 
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Old Nov 13, 2025 | 03:48 PM
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Check fuel pressure.
 
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Old Nov 13, 2025 | 03:50 PM
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Darn thats what I was scared of lol. I'll see if I can rent a pressure tester somewhere or find a cheap one. Would i have to connect it to the fuel line and drive to test? I'd assume up near the throttle body since it starts up fine until stalling?
 
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Old Nov 13, 2025 | 04:22 PM
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Oh, TBI..... Yeah. That complicates matters..... But, the tester you rent should have adapters to go inline with the fuel line. You don't need to drive it like that though. I think TBI wants like 15 PSI of pressure. If you have that at idle, it's probably ok.

You have a solenoid for idle speed, don't ya??
 
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Old Nov 13, 2025 | 04:27 PM
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We have adjusted the idle in the past but i thing it was a valve or the idle motor and that did help the stalling. put it at around 1500 rpm i believe, sadly i dont have an rpm gauge
 
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Old Nov 13, 2025 | 06:55 PM
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Yeah, I am just not that familiar with dodge TBI..... I have only owned second gens..... or cars that still had carbs.
 
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