Anyone with idle issues please look inside...
10/7/09, 01:34 PM
#63
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This thread deserves a bump, and IMO is sticky worthy.
My wife's car is an 05 with 68k miles. I recently installed a JTL CAI, JBA lt's + o/r h-pipe, and COMP NSR Stage II cams, with a tune from Doug. The car didn't want to idle very well, esp when cold, and the check engine light came on, with a P0506.
I happened across this thread last night and cleaned the TB today. HUGE difference. Car hasn't been cold enough to be 100% certain, but I cleared the code and it hasn't come back on. I also noticed a night and day difference in throttle response. There was a dead spot under light pedal pressure and that is GONE.
CLEAN YOUR THROTTLE BODIES!!!
Thanks again, Doug...
My wife's car is an 05 with 68k miles. I recently installed a JTL CAI, JBA lt's + o/r h-pipe, and COMP NSR Stage II cams, with a tune from Doug. The car didn't want to idle very well, esp when cold, and the check engine light came on, with a P0506.
I happened across this thread last night and cleaned the TB today. HUGE difference. Car hasn't been cold enough to be 100% certain, but I cleared the code and it hasn't come back on. I also noticed a night and day difference in throttle response. There was a dead spot under light pedal pressure and that is GONE.
CLEAN YOUR THROTTLE BODIES!!!
Thanks again, Doug...
11/12/09, 01:53 PM
#64
Took my throttle body off and cleaned it out good along with the MAF sensor. Car idles like it did the day it I picked it up from the Ford dealership. Thanks !!
Used both CRC products - Throttle Body Cleaner and Mass Air Flow sensor cleaner.
Used both CRC products - Throttle Body Cleaner and Mass Air Flow sensor cleaner.
2/5/10, 07:45 AM
#65
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So, no touching the MAF? Use electrical cleaning spray and the nastiness should just evaporate...
And I can use the same electrical spray on the throttle body?
Just give me a resounding YES if the above is correct
6/14/10, 09:31 PM
#67
TB clean now she takes longer to setttle down to idle?
I cleaned the TB and while I am happy with the improvement in throttle response, I did notice two things:
I did remove the TB since it made it much easier to clean it and I did open the butterflies and there seemed to be some controversy (maybe that's too strong) over whether it's OK to manually move the butterflies.
The only other thing I did at the same time was I replaced the air filter with a K&N drop-in. What do you guys think?
- It take much longer for the idle to get back below 1K
- When decelerating in gear the idle stays high longer as well. The result is I am not decelerating as fast I was previously when in gear.
I did remove the TB since it made it much easier to clean it and I did open the butterflies and there seemed to be some controversy (maybe that's too strong) over whether it's OK to manually move the butterflies.
The only other thing I did at the same time was I replaced the air filter with a K&N drop-in. What do you guys think?
6/16/10, 04:31 PM
#68
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I cleaned the TB and while I am happy with the improvement in throttle response, I did notice two things:
I did remove the TB since it made it much easier to clean it and I did open the butterflies and there seemed to be some controversy (maybe that's too strong) over whether it's OK to manually move the butterflies.
The only other thing I did at the same time was I replaced the air filter with a K&N drop-in. What do you guys think?
- It take much longer for the idle to get back below 1K
- When decelerating in gear the idle stays high longer as well. The result is I am not decelerating as fast I was previously when in gear.
I did remove the TB since it made it much easier to clean it and I did open the butterflies and there seemed to be some controversy (maybe that's too strong) over whether it's OK to manually move the butterflies.
The only other thing I did at the same time was I replaced the air filter with a K&N drop-in. What do you guys think?
6/20/10, 12:39 PM
#70
Mach 1 Member
Did you unplug the battery for ~10 minutes to allow the PCM to clear the bad idle trims and relearn those?
Did you allow the car to idle on its own for a couple minutes, idle with the AC on for a couple minutes after you reconnected the battery?
if not, you need to
Did you allow the car to idle on its own for a couple minutes, idle with the AC on for a couple minutes after you reconnected the battery?
if not, you need to
6/20/10, 08:28 PM
#71
If so I will try that tomorrow for sure!
Thanks.
6/20/10, 10:18 PM
#72
legacy Tms Member
First off, my thanks to Doug for posting this. I had the issue as stated in the initial post and a good cleaning did bring my idle back to where it should be. The second part of my issue is still occuring though.
When I release the throttle (changing gears, stopping, whatever) the RPMs rapidly fall. This rapid fall seems to also create a pressure surge in the exhaust causing loud popping, backfire like sounds.
I have now cleaned the TB / plenum, checked for vacuum leaks, and changed plugs and wires. I even went as far as running some Marvell Mystery Oil through my fuel system.
Any ideas?
Thanks,
TC
When I release the throttle (changing gears, stopping, whatever) the RPMs rapidly fall. This rapid fall seems to also create a pressure surge in the exhaust causing loud popping, backfire like sounds.
I have now cleaned the TB / plenum, checked for vacuum leaks, and changed plugs and wires. I even went as far as running some Marvell Mystery Oil through my fuel system.
Any ideas?
Thanks,
TC
6/21/10, 04:57 AM
#73
Mach 1 Member
The PCM always tries to adapt the idle and fuel trims based on the feedback it gets.
and the values it was using to work with the dirty throttle body need to be relearned now with a clean, better flowing TB
maybe I'm weird, but I'd love it if my car did this...as-is, it occasionally gives throttle closure when the engines cold, but the delay is there 99% of the time. Is this immediate throttle closure there in bamachips/dougs tunes? others? in the old carb days a strong engine would get that burble/cackle whatever when lifting the throttle...might be unrefined by todays standards, but I thought it was pretty cool
and most of the tuned mustangs i worked with, did what you're after (the exhaust burble as you lift off throttle) so i guess you gotta try getting an SCT X3 SF and see for yourself
6/22/10, 07:49 PM
#74
Thanks Louie.
That did the trick! She's running awesome now, throttle response is fantastic. It really is amazing how bad it got and how it sneaks up on you daily so you don't notice that much over time.
I put a drop in K&N in but I really want to get a CAI now. Just gotta find room in the budget.
That did the trick! She's running awesome now, throttle response is fantastic. It really is amazing how bad it got and how it sneaks up on you daily so you don't notice that much over time.
I put a drop in K&N in but I really want to get a CAI now. Just gotta find room in the budget.
12/30/10, 01:19 PM
#75
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I've received the P0506 code twice in the last week and three times in the last few months. Now I have a good idea as to why! Ordered the CRC cleaner and will pick it up on the way home and report results of RPM's both before and after. Anything other readings I should be looking at? I'm picking up the MAF cleaner as well. I have an Acron OBD reader that feeds me all kinds of info that I'm clueless about.
And yes, this really should be a sticky!
And yes, this really should be a sticky!
12/30/10, 05:51 PM
#76
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Well, I'm not sure it's made much of a difference in rpm's but WOW is the throttle response better. There's no hesitation or "dead zone" any more. Again, this should be a sticky. Thanks all!
1/2/11, 07:59 PM
#77
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What does TPS's stand for?
Also... I have had a P0300 code... random missfire that has been coming on and off like crazy since my cam install.
After having the car looked over big time, and having diagnostic tests on it done, and after changing plugs and having the COPS checked... I am being told it is a tuning issue due to something with the duration and rotation of the Hot Rod Cams.
So I am going back to have the tune looked at and adjusted.
I also have the hunting idle issue.
Could a dirty TB cause a random misfire code for some odd reason or is this more likely still a tune issue?
Last edited by Blacksmoke; 1/2/11 at 08:11 PM.
1/3/11, 06:51 AM
#78
Shelby GT350 Member
I think he means Throttle Position Sensor and since there's only one I'm not sure why he made it plural. I had idle issues and tried cleaning everything , but it was the electronics in the TB that went bad and once I replaced it they went away. I'm not sure about the TB causing a misfire code , but to me it doesn't seem like it would ...
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