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Topic: maf problem
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94gt
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Member # 3060
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posted
 
 
quote:
Originally posted by menlo pony:
i had a similar problem to the one on this discussion:
http://www.californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=009382
and i took off the maf sensor and k now my car runs like a champ ... what should i do? oh yeah and my car idle crazy now is that because i unpluged the maf sensor or is it something else?
um, you just "fixed" the symptom, not the problem.
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2020 Explorer ST
2011 Silver Raptor 'Screw
Posts: 5777 | From: Beavercreek, OH | Registered: Jul 2003
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menlo pony
still learnin'
Member # 4301
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posted
quote:
Originally posted by 94gt:
quote:
Originally posted by menlo pony:
i had a similar problem to the one on this discussion:
http://www.californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=009382
and i took off the maf sensor and k now my car runs like a champ ... what should i do? oh yeah and my car idle crazy now is that because i unpluged the maf sensor or is it something else?
um, you just "fixed" the symptom, not the problem.
thanks, but i cant find anywhere on my post where i said i "fixed" anything (infact the title says i have a maf problem)...
i know something is not right, i obviously cant go around driving with my maf sensor unplugged, but i would like to know what i SHOULD do so can anyone help me?
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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Blind
2.3L
CAFords OG
Member # 3052
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posted
if this is the same problem as your cold start post as before then the same thing happened to my friend last week.
unplug maf, ran fine.
plug in maf, wouldn't idle in park when cold.
replacing the distributor fixed the problem. Before that we cleaned the maf, and tried 3 different ones with no effect on the problem.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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menlo pony
still learnin'
Member # 4301
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posted
quote:
Originally posted by blind:
if this is the same problem as your cold start post as before then the same thing happened to my friend last week.
unplug maf, ran fine.
plug in maf, wouldn't idle in park when cold.
replacing the distributor fixed the problem. Before that we cleaned the maf, and tried 3 different ones with no effect on the problem.
what exactly do i use to clean the maf, and what part of the maf do i need to clean (the connection in between the wire harness and the sensor?)?
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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menlo pony
still learnin'
Member # 4301
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posted
and is it bad for me to drive around with my maf unplugged?
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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Jeff S
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Member # 371
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posted
quote:
Originally posted by menlo pony:
and is it bad for me to drive around with my maf unplugged?
Yes
[ November 16, 2004, 09:43 PM: Message edited by: Jeff S ]
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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The Nick
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Member # 2244
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posted
Ok, so if it runs bad with the MAF plugged in and you unplug it and it still runs bad, wouldn't that mean that the MAF is bad?
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Fast, Cheap or Reliable. Pick two and live with it.
Posts: 1215 | From: The Delta | Registered: Dec 2002
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Glenn
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Member # 520
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posted
quote:
Originally posted by blind:
if this is the same problem as your cold start post as before then the same thing happened to my friend last week.
unplug maf, ran fine.
plug in maf, wouldn't idle in park when cold.
replacing the distributor fixed the problem. Before that we cleaned the maf, and tried 3 different ones with no effect on the problem.
what year was th car?
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S-Trim,331,H/C/I
"JohnB groupie train"
My Car
DragGuam
Posts: 2009 | From: Stationed on a Pacific Island, Guam | Registered: Oct 2001
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menlo pony
still learnin'
Member # 4301
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posted
quote:
Originally posted by Glenn:
quote:
Originally posted by blind:
if this is the same problem as your cold start post as before then the same thing happened to my friend last week.
unplug maf, ran fine.
plug in maf, wouldn't idle in park when cold.
replacing the distributor fixed the problem. Before that we cleaned the maf, and tried 3 different ones with no effect on the problem.
what year was th car?
93
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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menlo pony
still learnin'
Member # 4301
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posted
quote:
Originally posted by The Nick:
Ok, so if it runs bad with the MAF plugged in and you unplug it and it still runs bad, wouldn't that mean that the MAF is bad?
runs good, idles bad
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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menlo pony
still learnin'
Member # 4301
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posted
quote:
Originally posted by Jeff S:
quote:
Originally posted by menlo pony:
and is it bad for me to drive around with my maf unplugged?
Yes
why? can you be specific!
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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Blind
2.3L
CAFords OG
Member # 3052
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posted
the computer determines the air/fuel mixture by the readings of how fast the air is coming past the MAF sensor, if thats unplugged that it can't do much can it?
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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menlo pony
still learnin'
Member # 4301
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posted
quote:
Originally posted by blind:
the computer determines the air/fuel mixture by the readings of how fast the air is coming past the MAF sensor, if thats unplugged that it can't do much can it?
what i dont understand is why the car runs better when the maf is unplugged then... sorry if it sounds stupid to you guys that i keep asking the same thing over and over, but i dont feel that i have recieved any good answers. do i just have a bad maf, do you need more info, can anyone try to diagnose my problem?
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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menlo pony
still learnin'
Member # 4301
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posted
quote:
Originally posted by blind:
the computer determines the air/fuel mixture by the readings of how fast the air is coming past the MAF sensor, if thats unplugged that it can't do much can it?
well apparently it doesn't know how fast the air is coming in when it is plugged in aswell, because my car runs like sh.. when it is plugged in.
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by menlo pony:
quote:
Originally posted by blind:
the computer determines the air/fuel mixture by the readings of how fast the air is coming past the MAF sensor, if thats unplugged that it can't do much can it?
well apparently it doesn't know how fast the air is coming in when it is plugged in aswell, because my car runs like sh.. when it is plugged in.
unfortunately you cannot determine the problem just by going about it the way you are.
best thing to do is find a buddy with a good running 5.0 and start swapping parts until it works.
that is what we did with my buddies car and it ended up being the distributor and it had the exact same symptoms yours does.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Jeff S
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Member # 371
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posted
quote:
Originally posted by menlo pony:
quote:
Originally posted by Jeff S:
quote:
Originally posted by menlo pony:
and is it bad for me to drive around with my maf unplugged?
Yes
why? can you be specific!
The MAF is basically the brain of your EFI computer system. It tells the PCM exactly how much airflow your motor is seeing and what load your car is seeing. The computer uses that info to make the A/F ratio what is commanded by the PCM and also how much spark advance to give.
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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jaybquick
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Member # 4286
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posted
The reason it runs better with it unplugged is because the computer goes into "limp in mode". This means conservative timing, and a pre determined fuel strategy based on throttle position and RPM. It is definitely not the best way to drive your car around. It will eventually eat up your cats and maybe more. It is easy to clean, just undo the 2 tamper proof torx screws on top, then lift it out. DO NOT TOUCH THE WIRES. First look at the little white elements on the wire and see if they look dirty. Then spray it off with brake parts cleaner until the elements look white. This was the coolest trick when I worked as a smog/driveability tech for 5 years. After that just put it back together and report back to us. The next step will to pull codes after you check and do this. It is not smart to just start changing crap and guessing, codes help alot in giving direction if you are lucky enough to have any. Do you have a K&N air filter? Hope this helps.
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91 Mustang GT ET: 11.92@115
66 Mustang ET: 11.43@119
01 Audi S4 ET: 10.8@131
05 Audi S4 ET: 11.9@116
08 Audi S5 ET: 11.9@118
Posts: 416 | From: Lathrop | Registered: Mar 2004
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menlo pony
still learnin'
Member # 4301
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posted
quote:
Originally posted by jaybquick:
The reason it runs better with it unplugged is because the computer goes into "limp in mode". This means conservative timing, and a pre determined fuel strategy based on throttle position and RPM. It is definitely not the best way to drive your car around. It will eventually eat up your cats and maybe more. It is easy to clean, just undo the 2 tamper proof torx screws on top, then lift it out. DO NOT TOUCH THE WIRES. First look at the little white elements on the wire and see if they look dirty. Then spray it off with brake parts cleaner until the elements look white. This was the coolest trick when I worked as a smog/driveability tech for 5 years. After that just put it back together and report back to us. The next step will to pull codes after you check and do this. It is not smart to just start changing crap and guessing, codes help alot in giving direction if you are lucky enough to have any. Do you have a K&N air filter? Hope this helps.
you were very helpful, thank you! i actually plugged it back in today after i got out of school, and it seemed to drive well... However i had a problem, as i posted before, i need to hit the gas pedal a couple of time to keep the car on in the mornings after its off for a while... When i disconnected the maf meter i did not have to do this (it felt kida nice, and im sure my neighbors apprieciate it too). I will see if it drives like sh.. tommorow, and we'll see if it stays on, on its own in the morning... i'll let you know,,, thanks again.
[ November 18, 2004, 03:07 AM: Message edited by: menlo pony ]
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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menlo pony
still learnin'
Member # 4301
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posted
and i have the filter that came with my my mac cai kit fenderwell... i can't remember if it was k&n. ![[patriot]](graemlins/patriot.gif)
[ November 18, 2004, 03:04 AM: Message edited by: menlo pony ]
Posts: 776 | From: Santa Cruz y Menlo Park | Registered: Mar 2004
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jaybquick
¯
Member # 4286
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posted
I only ask about the filter since the oil used to oil up K&N type filters can very easily dirty up a MAF quickly especially if over oiled. Keep us posted.
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91 Mustang GT ET: 11.92@115
66 Mustang ET: 11.43@119
01 Audi S4 ET: 10.8@131
05 Audi S4 ET: 11.9@116
08 Audi S5 ET: 11.9@118
Posts: 416 | From: Lathrop | Registered: Mar 2004
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