Engine stalling on 1991 Dakota 5,2l 4x4
#1
08-11-2018, 01:19 AM
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Engine stalling on 1991 Dakota 5,2l 4x4
Hi guys,
i recently bought a 1991 dakota 5,2l 4x4 and i have issues running it. The engine starts but stalls suddently. The previous owner told me that it happened when he put a new battery in. Today, when i pressed the gaz completely, the engine felt to like 500 rpm like if it wasnt receiving gaz and few seconds after it goes up. I held the gaz pedal for 30 seconds and it was consistently doing that. Trying to get rid of that problem, i noticed a high voltage on the cluster. When i start the engine, the fuel indicator goes empty. But when i put the key to On, it works good. When my dakota is idling, the engine runs but when i press the gaz it’s stalling. When i try to put it to Drive, it stalls or some time runs slow with difficulty.
I changed the IAC valve but it didnt solve the problem. I suspect the battery high voltage or a bad fuel pump.
Any suggestion?
I’ll be trying different batteries tomorrow.
Jordan
why o I tried my battery on my Civic into it
i recently bought a 1991 dakota 5,2l 4x4 and i have issues running it. The engine starts but stalls suddently. The previous owner told me that it happened when he put a new battery in. Today, when i pressed the gaz completely, the engine felt to like 500 rpm like if it wasnt receiving gaz and few seconds after it goes up. I held the gaz pedal for 30 seconds and it was consistently doing that. Trying to get rid of that problem, i noticed a high voltage on the cluster. When i start the engine, the fuel indicator goes empty. But when i put the key to On, it works good. When my dakota is idling, the engine runs but when i press the gaz it’s stalling. When i try to put it to Drive, it stalls or some time runs slow with difficulty.
I changed the IAC valve but it didnt solve the problem. I suspect the battery high voltage or a bad fuel pump.
Any suggestion?
I’ll be trying different batteries tomorrow.
Jordan
why o I tried my battery on my Civic into it
Last edited by Jordan Ouellet; 08-11-2018 at 01:23 AM. Reason: More details
#2
08-11-2018, 09:54 AM
Record Breaker
Look on the FAQ page. There is a section near the top about codes. It explains how to get whatever codes have set by turning the key on and off then counting the flashes of the chkegn light.Start there, try not to spend money on parts until you diagnose it properly. The FAQ page has a lot of info you don;t even know you want to know yet 
#3
08-11-2018, 11:45 AM
My 87 engine is so different, being they were carbed that year, so my advise is limited.
But, all engines are the same, need, fuel, spark, and compression, to run......
If it was mine, I would start with a fuel pressure guage and and see, if you are loosing pressure. If so, its fuel pump, filter, or electrical.....
If pressure stays constant, its not the pump.
But, all engines are the same, need, fuel, spark, and compression, to run......
If it was mine, I would start with a fuel pressure guage and and see, if you are loosing pressure. If so, its fuel pump, filter, or electrical.....
If pressure stays constant, its not the pump.
#4
08-11-2018, 11:28 PM
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I scanned my engine and the codes 12 and 24 appeared : 24 is Tps is out of range. So i tried different things
first : run the engine normally
second start the engine without tps sensor
third start the engine with tps and unplug it while its running
result : i see no difference at all
i guess my tps sensor is broken...
jordan
first : run the engine normally
second start the engine without tps sensor
third start the engine with tps and unplug it while its running
result : i see no difference at all
i guess my tps sensor is broken...
jordan
#5
08-12-2018, 07:34 AM
#6
08-12-2018, 07:45 AM
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I don’t have tools to check that... the pick up cannot move so it’s kinda hard to bring it to a garage... I ll try replacinh my tps and if that doesnt work ill check my gaz pressure... I think it went into limp mode because of that tps sensor so the pick up is ****ed up now haha
I ll give you news as soon as i receive that tps sensor !
thanks for your help buddy!
jordan
I ll give you news as soon as i receive that tps sensor !
thanks for your help buddy!
jordan
#7
08-12-2018, 08:13 AM
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#8
08-12-2018, 10:14 AM
Record Breaker
The TPS takes a Torx wrench. The fuel pressure can be checked easily, if you can get to a parts store and borrow the tool. It will be a pressure gauge. Remember its gasoline so try to be careful. There is a shrader vale on the driver side fuel rail near the firewall. It looks like the same air valve on you tires. Connect the gauge and turn on the key to see if you get pressure. IDK the correct pressure for the 91 but my 94 is 35+ PSI. Then if its good you might consider changing the TPS.
Last edited by onemore94dak; 08-12-2018 at 10:20 AM.
#9
08-12-2018, 10:38 AM
Champion
The TPS takes a Torx wrench. The fuel pressure can be checked easily, if you can get to a parts store and borrow the tool. It will be a pressure gauge. Remember its gasoline so try to be careful. There is a shrader vale on the driver side fuel rail near the firewall. It looks like the same air valve on you tires. Connect the gauge and turn on the key to see if you get pressure. IDK the correct pressure for the 91 but my 94 is 35+ PSI. Then if its good you might consider changing the TPS.
Alas, Mother Mopar didn't include a fuel pressure test point on the TBI jobbers.
(And here's a nice sticking point - it's 14.5PSI; at about 15.1PSI the injectors can't lift!)
I'd also be checking the wiring TO the TPS.
Jordan - Before you panic too much or toss too many parts at it, spend about $30 ( $24 plus shipping, guessing on the shipping!) with RockAuto and buy the PDF copy of the factory service manual - it's the Bishko CD/DVD that they list.
Start there with trouble shooting.
RwP
#10
08-16-2018, 06:47 PM
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