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ok ok, so this makes no sense, drove my car home last night and it was doing fine, no hessitation or anything i park it for the night, come back out in the morning to go to the store and it had a hard time cranking, it cranks over just fine but seems shaky while revving, backfires and wont hold an idle. compression is still good and theres no smoke out of the exhaust, no coolant leak.. i was thinking it could be a vacuum line, but it wouldnt just pop off by itself overnight with the car off would it?!
heeeeelp me |
Sounds like a bad AFM a.k.a MAFS
Will it hold idle if you held on the gas a bit? Also unplug the AFM then start it. See if it does the same thing. |
good idea, but would it go out randomly?
i mean i drove it home last night and it ran super smooth. it holds idle if i hold the gas down. |
could be intermittant....
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Originally Posted by j9fd3s' post='866461' date='Apr 3 2007, 02:18 PM
could be intermittant.... what could be? |
afm...
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matt the afm could be what was causing the startup issue. maybe its been going out and now it done done it
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Fuel injector could be stuck....
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Originally Posted by Shane.Trammell' post='866477' date='Apr 3 2007, 03:27 PM
matt the afm could be what was causing the startup issue. maybe its been going out and now it done done it guess ill pull it and see if it does the same thing... shane i thats the case, you should let me throw yours on to test it lol. |
Originally Posted by fcrotornut' post='866456' date='Apr 3 2007, 01:28 PM
good idea, but would it go out randomly? i mean i drove it home last night and it ran super smooth. it holds idle if i hold the gas down. Yes it would. Like j9fd3s said. Mine died just like yours did. And holding the gas down keeps it running.... im almost 90% certain it's your AFM then bud. |
ok heres the thing, i pulled the plug off the afm and cranked it, it was a noticible difference. it shook and hessitated and still wouldnt hold an idle.
so should i rule the afm out? |
Originally Posted by fcrotornut' post='866623' date='Apr 4 2007, 11:35 AM
ok heres the thing, i pulled the plug off the afm and cranked it, it was a noticible difference. it shook and hessitated and still wouldnt hold an idle. so should i rule the afm out? yes if it totaly acted different. if it acted the same it would be a bad AFM |
great.... now what the crap could it be?
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it didnt act MUCH different, it just stumbled a bit more... but otherwise it did the exact same thing.... we sure it cant be the afm?
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Originally Posted by fcrotornut' post='866642' date='Apr 4 2007, 12:57 PM
it didnt act MUCH different, it just stumbled a bit more... but otherwise it did the exact same thing.... we sure it cant be the afm? Well not for sure. I would only say for sure if I was there bro otherwise I can't really go off by what you say. I still say there's a good chance it's your AFM same **** happened to me that you describe. |
I had a similar problem with my 240sx which turned out to be the vacuum line from the brake booster to the motor. you might try getting the car started then look under the hood and listen for any hissing. could be AFM though :P hope you find it.
-B. |
Originally Posted by Mr. B' post='866683' date='Apr 4 2007, 03:15 PM
I had a similar problem with my 240sx which turned out to be the vacuum line from the brake booster to the motor. you might try getting the car started then look under the hood and listen for any hissing. could be AFM though :P hope you find it. -B. I thought he would say he heard a hissing noise if that was the case but maybe it is that he should check it anyways. |
theres a hissing noise but it comes from my intake.
ok here my thing about the vacuum line... it drove fine and i parked it and then went to crank it up and thats when i had the issue, how the crap could a vacuum line come off overnight with the car not running? unless it did it on startup. |
Originally Posted by fcrotornut' post='866687' date='Apr 4 2007, 06:23 PM
theres a hissing noise but it comes from my intake. ok here my thing about the vacuum line... it drove fine and i parked it and then went to crank it up and thats when i had the issue, how the crap could a vacuum line come off overnight with the car not running? unless it did it on startup. Ever heard of dry rot? it does not necessarily have to be at the end of the line per say but rather somewhere along the tube. my vacuum line cracked in half. had about a half inch gaping crack in the middle. idled terrible, at stop lights I had to keep revs up or it would die. sometimes even going down the road it would die. after I fixed it, no problems. -B. |
all the vacuum lines got replaced when i bought the car lol.
i mean all sorts of preventative maintnence has been done, i guess i can grab some starter fluid and try that trick. never know |
bump bump.
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i'm having the exact same problem.
car drove fine forever, minor issues here and there. then last week, i can't hold an idle at all. engine will stall if i try to hold it at under 2k rpm. i'm revving along local streets, growling my engine at 2k at redlights lol. i cant toe-heel very well, so i just stall let the car stall for turns, and just bump it back to life. the power steering cutting off just as i start the turn is a bit scary though. anyhoo, i've concluded its the AFM. now i don't know how to fix it though... do i just replace it? also, someone told me it could just be poor grounding. i've tried to search the forums about that, and got a few faqs. could someone please clarify what exactly i should do for grounding? i'm a car noob, and reading: 'there's a nut under the exhuast' means little to me. what exactly do i do? something about 8gauge wire, to my battery's neg terminal? please, if you have some spare time, guide me a little more explicitly as to what i should be doing when it comes to grounding. thanks for any help. '90 s5. btw. |
Originally Posted by foopy' post='867147' date='Apr 7 2007, 08:40 AM
i'm having the exact same problem. car drove fine forever, minor issues here and there. then last week, i can't hold an idle at all. engine will stall if i try to hold it at under 2k rpm. i'm revving along local streets, growling my engine at 2k at redlights lol. i cant toe-heel very well, so i just stall let the car stall for turns, and just bump it back to life. the power steering cutting off just as i start the turn is a bit scary though. anyhoo, i've concluded its the AFM. now i don't know how to fix it though... do i just replace it? also, someone told me it could just be poor grounding. i've tried to search the forums about that, and got a few faqs. could someone please clarify what exactly i should do for grounding? i'm a car noob, and reading: 'there's a nut under the exhuast' means little to me. what exactly do i do? something about 8gauge wire, to my battery's neg terminal? please, if you have some spare time, guide me a little more explicitly as to what i should be doing when it comes to grounding. thanks for any help. '90 s5. btw. YES JUST REPLACE IT WITH ONE THAT HAS THE SAME CODE ON IT AS YOURS |
I had a slightly different problem; my car was fine one night and drove awesome. I parked it and the only thing that was different the next day was that the temperature dropped 30 degrees. At about 3000RPM it bogged and had no power... I checked vacuum lines and found no leaks, I checked AFM resistance and it was good, checked timing and TPS they were ok. Re-checked all the turbo related lines and they were all ok except the turbo inlet duct had a good size crack on the turbo side, I wasn’t convinced that something before the turbo was causing power loss like I was experiencing so I took the UIM off and put a fresh gasket in between. Problem went away.... I must have had a leak inbetween the UIM and LIM. I later patched my TID... I couldn’t figure out why it was good when I parked it and the next morning it was shiat...
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its my afm, thre a friends on and she cranked right up and idles mooth at 800 like always, got mine coming from mazdatrix, but while she's down i plan on doing a bit more to it.
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aaand nevermind, she stopped idling again... and now wont crank, just spins and spins...
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shane trammell thinks it could be my tps, sound possible?
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check it for codes?
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