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97 pontiac grand am 2.4l missing and loosing power
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James_85_jr
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Mar 13, 2010, 1:56 PM
Post #1 of 19
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97 pontiac grand am 2.4l missing and loosing power
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when i drive up hill or try to take off quickly the car will loose power then start missing then it throws a code o2 sensor insufishent switching bank 1 and lean fuel condition it is imposible to stomp down the gas pedel when driving and get the car past 3000 rpm, so far iv replaced o2 sensor, intake air temp sensor, coolent temp sensor, map sensor, crank position sensor, cam position sensor, throttle position sensor, intake air control sensor, intake manafold, coil pack, spark plugs the car right now gets between 10 and 14mpg and its a 4 cylinder any help would be greatful
oh something else i just checked tonight was that my intake manifold according to my scanner is only got 8.5637in hg vacuum is this normal and my long term fuel trim is 21.875% my engine advance is between 19 and 24' o2 sensor is 0.6v all that while the engine was at 175' idling
(This post was edited by James_85_jr on Mar 13, 2010, 10:21 PM)
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Tom Greenleaf
Ultimate Carjunky
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Mar 14, 2010, 4:26 AM
Post #2 of 19
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Re: 97 pontiac grand am 2.4l missing and loosing power
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Just where is this 8.56 Hg vacuum reading coming from? At idle, manifold vacuum would normally be 18 Hg or a bit more. If checked at actual manifold vacuum and that low surprised it runs and suggests valve timing if off,
T
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oakleyrodney
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Mar 14, 2010, 10:32 AM
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Re: 97 pontiac grand am 2.4l missing and loosing power
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Check to make sure the catalyc converter is not pluged.....
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Tom Greenleaf
Ultimate Carjunky
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Mar 14, 2010, 2:59 PM
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Re: 97 pontiac grand am 2.4l missing and loosing power
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One bird for two stones: Take a real vacuum reading at known manifold vacuum at idle with a "T" in line to any item tapped into still has its vacuum. If reading is good (18 Hg or so as said) and is dang near the same reading at 2,000 no load rpms then exhaust restriction is pretty well ruled out. Less than 18 unless at some wild high altitude where you are would lead me back to valve timing - be sure that's right and a compression test may show even but low all around if valve timing is off.
If all adds up there we think of what next to check,
T
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James_85_jr
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Mar 15, 2010, 9:23 AM
Post #7 of 19
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Re: 97 pontiac grand am 2.4l missing and loosing power
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i did a compression test and each cylinder had between 185 and 195psi i don't have a real vacuum gauge right now so i cant test the vacuum right now
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Tom Greenleaf
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Mar 15, 2010, 2:41 PM
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Re: 97 pontiac grand am 2.4l missing and loosing power
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That's up there for compression so vacuum would also be fine at idle. For now I'm out of ideas on what to chase down next
T
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Hammer Time
Ultimate Carjunky
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Mar 15, 2010, 3:16 PM
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Re: 97 pontiac grand am 2.4l missing and loosing power
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If your sure the engine is misfiring under load and it has new coils and plugs, then what you need to do is replace the white plastic coil housing. This is a very common problem on that engine. That housing works like a distributor cap on that engine and they crack internally but you can't see the crack. Change the plug boots at the same time if you haven't already.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Mar 15, 2010, 3:17 PM)
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James_85_jr
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Mar 15, 2010, 5:10 PM
Post #10 of 19
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Re: 97 pontiac grand am 2.4l missing and loosing power
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i took the top edge of the timing cover loose just enouf to look in on the cam gears and i noticed that the plastic guide at the top is very loose and the chain isn't rubbing it also it appears that the exhaust cam is about one tooth out of time when the front cam is in time could it be that the chain guides are just worn out?
also it seems that some how the last time i started it i smelled gas fumes real strong and finally traced it down to gas being in the oil somehow. you can pull the dipstick and smell gas on it if this is relevant
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Tom Greenleaf
Ultimate Carjunky
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Mar 16, 2010, 2:15 AM
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Re: 97 pontiac grand am 2.4l missing and loosing power
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Gas smell in oil isn't good! Usually a fuel injector overdoing it and you might find oil too full. That and a tooth off needs to be tended to for further understanding of any misfire or loss of power which may be solved by repairing that. Surprised compression was that high even off just one tooth!
T
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James_85_jr
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Mar 16, 2010, 2:12 PM
Post #12 of 19
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Re: 97 pontiac grand am 2.4l missing and loosing power
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it was due for a oil change anyway i set the timing correct today and drove it had tons of power till it jumped again i think sounded like a gravel popped up and hit the car then it started doing the same thing again. i think i need a new timing tensioner, chain, and guides the top guide isn't even touching the chain.
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Loren Champlain Sr
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Mar 16, 2010, 4:51 PM
Post #13 of 19
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Re: 97 pontiac grand am 2.4l missing and loosing power
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James; No misfire codes? What kind of fuel pressure are you seeing? Plugged fuel filter? Dirty injectors? Check injector resistance on all four.
Loren
SW Washington
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steve01832
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Mar 16, 2010, 4:54 PM
Post #14 of 19
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Re: 97 pontiac grand am 2.4l missing and loosing power
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Hey, Loren is still alive!! lol
Steve
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James_85_jr
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Mar 17, 2010, 2:48 PM
Post #16 of 19
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Re: 97 pontiac grand am 2.4l missing and loosing power
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i'm going to get the new coil housing tomorrow i checked the timing and it didn't jump the last time i drove it it just started missing real bad and bogged down and killed the motor and it fired right back up when i tried to start it so the one notch out of time didn't do anything that i can notice
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James_85_jr
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Mar 18, 2010, 10:35 PM
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Re: 97 pontiac grand am 2.4l missing and loosing power
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i know about them bending the valves this is the third engine put into this car because of that fact. wish it wasn't like that
ended up being the coil housing that had cracks in it making it miss now it runs great time for me to start working on one of the other 4 cars that is torn up at my house 
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Hammer Time
Ultimate Carjunky
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Mar 19, 2010, 4:00 AM
Post #19 of 19
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Re: 97 pontiac grand am 2.4l missing and loosing power
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Yep, those coil housings will get you every time. Thanks for report back with the fix.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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