bad cam sensor?
09-09-2006, 02:42 PM
#1
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bad cam sensor? for the longest time i thought it was tuning but now i know it's not. but i'm also not sure what it is. the car has been bogging down and has hesitation problems. i'm thinking cam sensor or crank sensor but not sure. fuel filter, pump, pressure, injectors are all fine, new spark plugs and wires. any help would be appreciated this problem has been going on for awhile and is starting to empty my pockets. thanks, Bill
09-09-2006, 05:06 PM
#3
If youve got HPTuners, try doing a CASE relearn. Failing that, pop out the cam and crank sensors and look for debris stuck to the magnetic end. That can throw things off. No DTC's I assume?
BTW, The angle you took the pic in your sig makes it look like youve got an 18" wide tire in the rear right. And a donut on the rear left.
BTW, The angle you took the pic in your sig makes it look like youve got an 18" wide tire in the rear right. And a donut on the rear left.
09-09-2006, 05:42 PM
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the code was p0300 multiple misfires detected, i forgot to add that sorry. i just had it tuned with efi live however i don't have any software myself, all i have is a code reader. i have 11in TT II's in the back with 315 tires, but i see what you're saying.
09-09-2006, 06:09 PM
#5
Originally Posted by 00blownWS6
for the longest time i thought it was tuning but now i know it's not. but i'm also not sure what it is. the car has been bogging down and has hesitation problems. i'm thinking cam sensor or crank sensor but not sure. fuel filter, pump, pressure, injectors are all fine, new spark plugs and wires. any help would be appreciated this problem has been going on for awhile and is starting to empty my pockets. thanks, Bill
Same as you, I checked /replacaed plugs & wires, I also suspected and replaced my cam sensor. Same as you, i still had the problem, I also elimited fuel filter, pump, pressur & injectors.
Finally I had to break down and get my friend/mechanic involved, he has access to scanning & loggin software (as I dont).
It turns out I had a bad coil on cyl#4. To add salt to the wound, my coils are the fancy MSD's that I bought & installed 10 months ago.
We got a replacement, installed & life should be good here again. I only had the car back for a day, but he had monitored it long term after the coil replacement wihtout any ill effects.
So check out your misfires, and at what cyl or cyl's (may be more than 1). Do you have stock coils? I know they are supposed to be resiliant - but hey, nothing is perfect - its worth checking out.
Hope this helps, let me know!
09-11-2006, 08:57 PM
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all of my cylinders are missfiring but in particular #6cyl. i was thinking coil pack myself but not sure. anyone know of anything about a map minumum/maximum setting??? my brother had this issue when he put a cam in his car and had to change his settings around...wonder if mine could be the same?
09-12-2006, 06:22 PM
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Used a digital timing light to see if the missing was coil related and all didn't skip a beat...even swapped packs from side to side...no change 
The plug wires all checked out at 340 to 360ish ohms....listened for the double click, disconnected the MAF...the missing at 1900rpm is more pronounced with it disconnected. I'm stumped....wiring looks good..just one more thing to check tonight...IAC...stupid maybe...but it's the last thing in the book before a crank sensor replacement and relearn 
As mentioned before...this car ran awesome after the tune and several days after until driving home and then the miss returned
The plug wires all checked out at 340 to 360ish ohms....listened for the double click, disconnected the MAF...the missing at 1900rpm is more pronounced with it disconnected. I'm stumped....wiring looks good..just one more thing to check tonight...IAC...stupid maybe...but it's the last thing in the book before a crank sensor replacement and relearn As mentioned before...this car ran awesome after the tune and several days after until driving home and then the miss returned Trending Topics
09-13-2006, 03:00 PM
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I have had many issues like this. I blew the cam sensor twice and the crank sensor once. Bad sensors give off a specific code, however. Bad cam sensors cause starting issues since the CPU is trying to find the cam position for firing purposes.
One thing you should check is the MAF. If your running an aftermarket unit, replace it with the stock unit and see if that helps. A bad MAF or poorly tuned car can cause these issues.
Since you got random misfire codes, re-check ALL the plugs, wires, coils, and CPU cable connections once more.
One thing you should check is the MAF. If your running an aftermarket unit, replace it with the stock unit and see if that helps. A bad MAF or poorly tuned car can cause these issues.
Since you got random misfire codes, re-check ALL the plugs, wires, coils, and CPU cable connections once more.
09-13-2006, 03:50 PM
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i replaced the cam and map sensor since i was back there a few days ago and no change. i've checked the plugs, wires, coils a hundred times and all the fuel components are brand new. its not the MAF either. anyone know anything about redoing the map settings??? would IAC be a cause?
09-17-2006, 10:42 AM
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i unplugged the maf and it runs perfect, i swapped it out with a known good maf it still ran like ****. i cleaned both of them with electrical cleaner and still no change. so maybe it is tune related. after my last tune the car ran perfect for about a week, now it has hesitation problems that won't go away...wtf?
09-17-2006, 11:03 AM
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Originally Posted by 00blownWS6
i unplugged the maf and it runs perfect, i swapped it out with a known good maf it still ran like ****. i cleaned both of them with electrical cleaner and still no change. so maybe it is tune related. after my last tune the car ran perfect for about a week, now it has hesitation problems that won't go away...wtf?
09-18-2006, 11:00 AM
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Originally Posted by 00blownWS6
thats what i'm thinking, but the one thing i can't figure out is why i don't pop any codes when i drive it with the MAF unplugged!?
09-18-2006, 11:41 AM
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i will try that and see if it pops a code. another guy had this same problem and he said it was the tune. something about the maf and map sensors fighting against each other and made it hesitate at part throttle. wonder if mine is doing the same!?
