Mustang reving abnormally

[Hawk5252]

Guys -

Can use some help or advice. I noticed Saturday that my 2005 Mustang Gt was reving abnormally when I came to a stop sign. It would drop down to ~500 rpm and then rev back to ~1200 rpm. Bounce back and forth for a few seconds before settling into 800 rpms. I do have an Demolet 93 octane tune and have posed this same question to John to see if he has any ideas, awaiting response. I have been working on installing a Zex system but not 100% installed. Spoke to some Comp Cam guys and they suggested that I may have loosened the Air Control located on the throttle body. Right now I am kinda stuck and need any help or suggestions anyone might have.

thanks....

 

[HEAVYGT]

Guys -

Can use some help or advice. I noticed Saturday that my 2005 Mustang Gt was reving abnormally when I came to a stop sign. It would drop down to ~500 rpm and then rev back to ~1200 rpm. Bounce back and forth for a few seconds before settling into 800 rpms. I do have an Demolet 93 octane tune and have posed this same question to John to see if he has any ideas, awaiting response. I have been working on installing a Zex system but not 100% installed. Spoke to some Comp Cam guys and they suggested that I may have loosened the Air Control located on the throttle body. Right now I am kinda stuck and need any help or suggestions anyone might have.

thanks....

What kind of CAI do you have...???

 

[JTGrant]

The 05 and up stangs don't have an Idle air control valve, it all done electronicly by the PCM and the Throttle body.

 

[Hawk5252]

Heavy - It is a Demolet (Tuneable Inductions) with SCT xcal2 93 octane tune.

JTgrant - I think the guys at comp cams were speaking of the wire connection - plan to check it out as soon as i get outta work - not sure about this one.

 

[DarkFireGT]

Try reloading your tune. I reload my tune before very race night, and about every other fill-up.

 

[fartingchicken]

Need to run some Techron additive or BG 44K?

 

[SP_51-F1]

Clean your throttle body. Use a throttle body cleaner that will not harm the coating.

 

[kkdoughboy]

I'm not sure if you mounted the spray nozzles for the Zex unit yet, but if you did make sure you dont have an air leak in the CAI where you drilled your hole for mounting. Also, check the TPS wiring and make sure you didnt pull a wire out when tapping into it for the NMU

 

[Hawk5252]

Thanks guys - I reloaded the tune and cleaned the throttle body - it seemed to help - time will tell. It was cruded up pretty bad, imo. I did check the wiring and where I tapped into the CAI - it checks out ok. I will drive a couple of days and probably clean the throttle body again and make it a part or recurring maintenance. I really appreciate everyone's help - I can only imagine what they charge to clean the throttle body.

 

[welchy]

I had the same problem. My CAI had come loose and was sucking too much air. Make sure you do not have any air leaks any where, everything tightened up , etc..

 

[ski]

Cleaning the MAF sensor may also help.

 

[welchy]

+1 That is what I thought was wrong with mine until I cracked the hood.

 

[Hawk5252]

hey guys - what is the best way to clean the MAF sensor?

 

[DarkFireGT]

hey guys - what is the best way to clean the MAF sensor?

Autozone sells MAF cleaner. It's just a spray.