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Old 03-22-2013, 08:14 AM   #1
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I know what's not causing the problem because I already replaced it. :)

I have a 2001 grand Cherokee straight 6. Its engine lopes at idol and has NO power when accelerating. The fuel pressure is almost 20lbs high. I have replaced the fp regulator map sensor and up stream o2 sensor. I have dropped the tank to check the return line and sprayed for vacuum leaks. (Please note the order I did these in is not necessarily the order in witch I have listed them in.) I can't figure it out. Any ideas?

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Old 03-22-2013, 08:21 AM   #2
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Check your FUEL FILTER... I had the exact same problem with my pathfinder. Pulled the fuel filter and the inside of it had broken free and was rattling around inside and restricting fuel flow. Replaced the filter...problem solved!

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Old 03-22-2013, 08:25 AM   #3
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Filter is built in with regulator~ I should have mentioned that sorry
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Old 03-22-2013, 09:22 AM   #4
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How is the exhaust flow out of the tailpipe? Could be a plugged CAT.
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Old 03-22-2013, 09:34 AM   #5
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Seams fine to me and I was starting to look in that direction last night but I just don't know enough about the exhaust system. When you really give it gas (and it has no power) it will sometimes smoke... and it seams to have average exhaust flow with no fumes entering the jeep.
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Old 03-22-2013, 09:56 AM   #6
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Does the engine give you any codes?
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Old 03-22-2013, 09:59 AM   #7
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How is your airfilter? When was the last time it was tuned up? Etc.
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Old 03-22-2013, 10:02 AM   #8
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Are you running after market air filter like K&N? to much oil sprayed on there will coat the mas airflow censor and confuse it pull it out and clean it with carb cleaner and put it back see what happens.
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Old 03-22-2013, 10:11 AM   #9
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Air filter is stock and clean I keep regular maintenance on it and have no codes
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Old 03-22-2013, 10:42 AM   #10
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Do you have someone that can cut out the cat for a test drive, it will be loud but you get the idea. After the test if it's OK put it back or if that's the problem replace it.
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Old 03-22-2013, 11:08 AM   #11
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No I'm a single mom with no mechanically inclined friends. I am also the one everyone I know turns to for car work and I know just enough to get in trouble lol. But I can drill some holes and check the pressure before and after. I just didn't want to do this yet.
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Old 03-22-2013, 11:13 AM   #12
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I completely understand Jessica, keep up the good work!

I would not drill holes in it in my opinion, maybe check with a muffler shop to see if they would do it cheap provided that if you do need a new one they do the work??
Can't hurt to try, know what I mean?

OK just thought of this, what about your local high school? They almost always have a welding course, maybe they could help YOU and in turn get THEM a little experience?
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Old 03-22-2013, 11:45 AM   #13
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That's not a bad idea I just called around and I have to say the prices were more than I was expecting. (wish I had paid more attention in my own shop classes lol)
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Old 03-22-2013, 12:03 PM   #14
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Good luck to you and be sure to let us know what you find.
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Old 03-22-2013, 12:59 PM   #15
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Ok... Jessica let's look at this differently... Assuming you're getting good fuel flow are you getting good spark? Have you checked all the spark plugs to make sure they're in tight nothings come loose? How old of the spark plugs , wires and DC? Spark plug boots are tight on both ends not shorting out...
Emergency brake is off when you're Accelerating... sorry couldn't resist...
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Old 03-22-2013, 01:14 PM   #16
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All spark plugs and wires are basically new. And looking in mirror I did not see stupid tattooed to my forehead so I don't think I have been driving with E break on. Am having it pressure tested as soon as it magically puts its self together again lol it's cold out.
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Old 03-22-2013, 04:39 PM   #17
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Ok it is not my cat
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Old 03-22-2013, 05:21 PM   #18
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Quote:
Originally Posted by jessica. View Post
Ok it is not my cat
Didn't know you had a cat?
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Old 03-22-2013, 05:38 PM   #19
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Lol I wish I had a cat to blame I meant to say it's not my catalytic converter
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Old 03-22-2013, 09:43 PM   #20
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Jessica,
just for grins did you check your EGR valve? sounds crazy but it is a possibility stop by a parts store and see if it throws a code. or I believe you can read the codes by turning your key to the on position pushing in on it and turning the key off and on three times stopping in the on position make sure you keep the key pushed in your dash lights should flash followed by a code which you should be able to get off the internet.
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Old 03-22-2013, 10:04 PM   #21
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Quote:
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Jessica,
just for grins did you check your EGR valve? sounds crazy but it is a possibility stop by a parts store and see if it throws a code. or I believe you can read the codes by turning your key to the on position pushing in on it and turning the key off and on three times stopping in the on position make sure you keep the key pushed in your dash lights should flash followed by a code which you should be able to get off the internet.
I am not throwing any codes~ I know the key dance but I prefer to use my code reader so I can properly clear it without having to reset my stereo. Thank you though I know someone out there will know what it is so keep the ideas coming! Or if you want drop by and take a peak under my hood lol
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Old 03-22-2013, 11:05 PM   #22
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Might be time to pressure test your cylinders. Poor compression could lead to the symptoms you describe. I believe the major auto parts stores will rent/loan the jig for that. Any obvious foam/bubbles in your oil?
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Old 03-22-2013, 11:15 PM   #23
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Nope no foam or bubbles~
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Old 03-23-2013, 09:12 AM   #24
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Ok I am wearing my dunce hat. Just realized I didn't check for vacuum at the fuel pressure regulator. And quite frankly the book doesn't give me enough information to do it.
Section B is all it gives on this. I know witch one is the vacuum line. But I don't know how to check it without starting the jeep~ and how much vacuum should there be?
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Old 03-23-2013, 10:26 AM   #25
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Talking

Quote:
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Ok I am wearing my dunce hat.
Pictures or it's a LIE...
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Old 03-23-2013, 06:13 PM   #26
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Fixed it!!!!! Thank you to everyone who offered ideas. It was the vacuum line to the regulator. Now on to the transmission at least I know what I am doing there
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Old 03-23-2013, 10:50 PM   #27
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Nice work, i love it when people work through their problems on forums and actually say what fixed it. Too many open ended questions out there. again...good work.

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