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98 ram 5.9 runs as soon as you give it gas it bogs out like timing is off retarded running really rich replaced plugs and wires cap rotor vehicle ran great next morning began to bog down barley make it up hills thought cat might be pluged so took out o2 sensor reved up a little higher but still boggs down i know its running rich really rich i get high of it cause it bellows out black smoke when i rev thinking its the cam or crank sensor would it run at all with either one of these bad o and there are no dtcs set i know the problem just cant pick the sensor that would cure it has compresson spark fuel just acts like timing is off is it possible to have a bad sensor and no code

Submitted: 158 days and 21 hours ago.

Category: Car

Value: $23

Status: AWAITING CUSTOMER ACTION

1998 Dodge ram 1500 5.9l gas

Already Tried:
i have replaced the iac and cleaned out injectors also replaced all 8 injectors cap rotor plugs wires 2 times this week just to be shure it was not the parts have a genesys scanner but there are no codes i did this tune up for a freind drove it one day then this happend i cannot get any ohms from the crank or cam sensor dunno if its good or bad it runs rich really rich when i unplug the sensors it wont start is how i figure that they are working but i dont know if either one is working correctley if it was an old chevy i would say it runs like the timing is retarded so bad that when u give it gas it bogs out till it dies cannot for the life of me figure this out been on this truck at work for 3 days the fumes are getting to me pcm appears to be working everything appears to work but just not correctly what sensor would cause this and not set a dtc

Accepted Answer

Hi, I will do my best to assist you. When you are finished please click on accept. I don't get paid unless you do. I don't know if you are a pro or a novice so we may have to fine tune the answer.

Your crank amd cam sensors should be good. If they are bad normally it wont run. It sounds just like a bad MAP sensor. When they go bad the vehicle goes rich and has no power usually. It will cost you about $85 most places,so I hate to guess, but if it was mine I would probably try it. Now it could always be something else, so it is taking a risk if we guess. I am here to help. Good luck, and Thanks for using Just Answer.

I hope this helps, 100% satisfaction is my goal. If the answer is not clear, please reply and I will assist you more. When you're satisfied, click on accept. I don't get paid unless you do. A bonus and positive feedback are always appreciated, good luck and Thanks.

Accepts:
Expert:	Dr. Hamman
Pos. Feedback:	99.3 %
Answered:	6/16/2009

Automotive Engineer

30 years experience, Repairing, building, & designing, automobiles.

158 days and 21 hours ago.

Reply

i tested it with an oh meter i think i got 0.64 and 0.34 on the ohms meter i dunno what they should be but i assumed it was ok but the other question is why dont i have any dtcs on my pcm this thing really floods out and it just happend a day after i did a tune up

Posted by Dr. Hamman 158 days and 20 hours ago.

Answer

Hi, I will do my best to assist you. When you are finished please click on accept. I don't get paid unless you do. I don't know if you are a pro or a novice so we may have to fine tune the answer.

If it happened right after a tune up it makes it a little more likely to be something else. The map can fail at any time though. Basically the temp sensors, the MAP, and the oxygen sensors help the computer adjust the fuel delivery. Normally it is one of these that fail. The MAP can fail without a code. If the O2 sensor fails the engine will not run bad. I would check the fuel pressure, and the temperature sensor. Make sure the temp sensor, and the MAP sensor have a good clean tight connection. Also look at the engine to see if you may have disturbed any wiring when you tuned the engine up. Pay particular attention to the grounds. If none of that helps then I would consider changing the map sensor. If you have any more questions I am here to help. Good luck, and Thanks for using Just Answer.

I hope this helps, 100% satisfaction is my goal. If the answer is not clear, please reply and I will assist you more. When you're satisfied, click on accept. I don't get paid unless you do. A bonus and positive feedback are always appreciated, good luck and Thanks.

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