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  #11  
Old 10-26-2010, 08:53 AM
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do you notice a loss of power
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  #12  
Old 10-26-2010, 08:57 AM
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Quote:
Originally Posted by mjshealy View Post
Thanks 98, i appreciate your response. I'm firm with believing there are no DTC's, so it's not a sensor issue. There's always been people telling me "that's not true, the light doesn't have to be on for a computer controlled sensor to be bad" But, in my 9 years of working on vehicles i've never found one with a bad sensor that didnt flash a code. I'm not going to replace the MAP. That would be acting different and steady if it was. Coonhound (lol) i will be checking the crank sensor tonight for tightness and do an electrical test. And no ramtech, the plenum gasket is ok. I've leak searched intake mani and the TB for leaks, none found. No vacuum leaks that i can find either. Im so lost i don't even know what to do. It's been connected to my brother's girl's uncle's Commercial OBD-2 scanner and he said there isn't anything he can find either. Thank you guys for your input, but PLEASE keep it coming, i really need this truck. thanks.
Did you check the plenum pan gasket for a leak with a vacuum gauge? That's the only way to be sure. I'm not saying you should replace the MAP sensor, but it should be tested as failure without setting a code is common with them.
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  #13  
Old 10-26-2010, 09:01 AM
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ram tech thanks for the advice the other day my map was falty it is running better but still isn't right i'm going to check the plenum gasket to see for sure but thats is about my last option i have checked about everything else
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Old 10-26-2010, 09:21 AM
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Did you check the plenum gasket with a vacuum gauge? That's the only right way to do it since you can't see the gasket without removing the intake. No DTC's doesn't mean it can't be something like a MAP sensor sending faulty info to the PCM so checking it would be a good idea since it can fail and not set a code. What sort of test are you going to do on the sensor? Do you have a lab scope you can use to watch the waveform?

Last edited by RamTech; 10-26-2010 at 09:23 AM.
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  #15  
Old 10-26-2010, 09:55 AM
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Listen to randy he told me the same thing last week on mine. Had no dtc and it was bad thanks randy for the advice what is the best way to hook up a vac gauge to check the plenum?
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Old 10-26-2010, 10:03 AM
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  #17  
Old 10-26-2010, 11:05 AM
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thanks again randy
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Old 10-26-2010, 01:33 PM
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How many miles do you have on her and have you ever changed the fuel filter, probably in the tank? Have you connected a pressure gauge to the Schroeder valve on the fuel rail to see if the pressure changes when this occurs to see if the fuel pump is going out. They aren't light switches and sometimes go out by not being able to keep up, giving enough fuel one minute and not enough the next.
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Old 10-26-2010, 06:03 PM
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theres a little over 100,000 miles on it. Fuel filter has not been changed, there's only the sock on the pump... but fuel delivery seems like it's ok, ill check the tank as a LAST option...lol. But seeing as how it will run rough and then kick back up and run fine, and run totally fine if i floor it, i severely doubt it's the filter.As posted before, fuel pressure was checked and did not fluctuate or change once problem starts. There is no loss of power when it's running ok, which is very rare now. It's pretty much undrivable now. Ramtech, i was going to test the MAP by however it says in the haynes manual, haven't got a chance to look yet. I will look things over and try some tests when i get done posting. What's the best way to test for a gasket leak? i used carb cleaner and then soap when the carb cleaner showed no leaks or change in idle.
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  #20  
Old 10-26-2010, 06:15 PM
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If your pressure stays up than you're probably ok. When my fuel pump went out it would be driving fine, then all of a sudden just felt like power was being zapped and she was slowing down no matter how much throttle till I would have to pull over. Would run rough, or die. If I shut it off and let it sit it would run good again for a bit then do the same thing. The harder I drove it the faster it showed the symptoms. Fuel pump wasn't keeping up.

Not saying this is your issue, but wanted to give you my symptoms so you could compare. Definitely understand not wanting to change it. It was a bear.
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