I just installed a GMS MAF on my 97 Expodition 5.4L and I getting 2 codes, p1132 & p1152. I'm stumped. I just went through several things trying to fix a CEL problem after installing a cold air intake, I finally got that fixed. So I choose this simple mod now another problem. I almost thing it's not worth the hassle doing these mods if they just cause more headache. Anybody else have a similar problem after their install? TIA

 

tanzuki,

I'm not sure what a "GMS MAF" is. But if it is a larger than stock MAF, you'll need a custom "burned" chip to compensate for it.

Post your question in the "Chips Forum" or contact MikeTroyer who uses the nane "Superchips Distributor" in that forum. Also found at: TroyerPerformance.com

Good Luck,

Bill

 

By GMS MAF I assume you mean Granatelli Motor Sports Mass Air Flow ?

I installed the exact same MAF on my truck with no issues whatsoever.

Did you take care to be sure there are no vacuum leaks ? Did you check to be sure the IAC is pushed in all the way and aligned properly ?

How did you fix your CEL after the cold air intake was installed ?

wmcnally is correct - You should have your chip re-burned to compensate for the new airflow volume. You are probably running lean now which could cause you serious issues in the future. Call Mike T. and get that re-burn ASAP.

 

Pretty sure there are no vac leaks. What is the IAC? Is that the little sensor that is in the air intake tube after MAF sensor? If that's the case I didn't touch that sensor while installing the new MAF sensor. How do I reburn my chip? I read on GMS website that I may need to recalibrate the MAF sensor when used with a cold air intake. Is this the same thing? Who has done this?

As for the problem I had before I had a thread running a while back about my problem. I had a "P"code that was saying that the system was too rich. After lots of searching on this board I found that the PCV tube where the rubber 90* fitting was often creating alot of problems, most of the time it cracking and causing a vac leak, this causing a too lean code. Well mine on the other hand was a too rich code was caused by the 90* fitting being so deterated that the vacuum actually caused the fitting close in on its self. Pretty simple. I just wish I would have know about you guys eairlier and I prolly could have saved some money from the other stuff I had done to try to fix the problem. Ohwell you live and you learn, right.

 

The PCM tries to compensate for the extra air because of the new MAF and richens up the A/F. The O2 sensors are supposed to switch from rich to lean and from lean to rich continously. When the A/F goes so lean that the PCM has to continously richen it up then it sets the codes. Make sure there no Vacuum leaks or any air leaks after the MAF. Check everything twice. Once you are sure then trinstall the old MAF reset the codes and see if a new one sets. If they set again then it is not the new MAF. By the description of your problem it does seem that the new MAF is the problem.
Call GMS. Check out their FAQ's; When do I need cold air tuning?
Cold air inductions significantly increase airflow and can cause tremendous turbulence in the air intake stream. When using the GMS mass airflow sensor with any type of cold air induction, high flow induction, or high flow air filter, your GMS mass airflow sensor must be calibrated with cold air tuning or a check engine light can occur. A “C” as the last digit in the part number designates cold air tuning. Cold air tuning is also available for existing GMS mass airflow sensor owners - please call 805-486-6644 for details.

Regards

Jean Marc Chartier

 

check pcv lines and vac lines seen this alot down in the south the last one the pcv line was compressing.most of the time you do not need a custom chip, i lot of us are still running a standard. just a thought. hope it helps.
dale

 

Just a quick question for those of you who got codes/CEL's/etc when you installed the GMS MAS...did you have problems immediately or was it something that took a while to pop up? I just installed one on my truck, went on a "spirited" drive and no lights or anything...just wondered if it was something that would happen after time...

Thanks for any info...

PS...actually noticed a "significant" change in the truck judging by my "butt dyno"...

 

Looks like I spoke to soon...after two days of driving with the new MAS, got a light....

 

Take it to a place to have the codes read. Mine said somthing like "HO2 detects system too rich". All my O2 sensors are brand new about a year ago and the CEL says off with the stocker MAF sensor installed. I think I need to have it clod air tuned. It cost $145 to have GMS tune it. I bought it off Ebay for $100 so I'm still ahead of the game by about $100 (if that takes care of the problem). I haven't sent it off yet, it makes me kinda nervous investing $145 in somthing and risk it not fixing the problem. For the meantime I just removed the GMS sensor out of the housing and installed the stock sensor in the GMS housing, so I'm at least getting more flow.

First Time ford- make sure that the GMS sensor corrisponds with the stock sensor with how many pins the connector has. It should be either 4 or 6 pin, make sure the GMS sensor matches the stock one. Also if you bought it brand new GMS should help you eliminate the problem. My friend just went through the situation. Good luck

Tim

 

Pulled the codes today...

P0171 System Too Lean (Bank no. 1)
P0174 System Too Lean (Bank no. 2)

I really don't like the idea of paying GMS $145 to "re-tune" the MAS, but like Tanzuki this was one of those Ebay deals and I've only got $100 tied up in it so far...

Is there any other way to fix this (besides removing the MAS) and how much damage am I actually doing to the motor running it lean?