# 1989 Mustang GT MAF sensor error code fixed \>

**URL:** <https://community.cartalk.com/t/1989-mustang-gt-maf-sensor-error-code-fixed/79128>\
**Category:** Maintenance/Repairs\
**Created:** [May 5, 2013, 9:50am UTC](https://community.cartalk.com/t/1989-mustang-gt-maf-sensor-error-code-fixed/79128 "2013-05-05T09:50:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Howie32703](https://avatars.discourse-cdn.com/v4/letter/h/2acd7d/32.png) [@Howie32703](https://community.cartalk.com/u/Howie32703)\
**Post date:** [May 5, 2013, 9:50am UTC](https://community.cartalk.com/t/1989-mustang-gt-maf-sensor-error-code-fixed/79128/1 "2013-05-05T09:50:33Z")

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I have an 89 mustang GT 5.0 5 speed ( 111k ) and was having these problems…when coming to a stop and in gear the car would buck, and throwing a CEL.  
and also on WOT acceleration. I do not have a code reader for this car but did it manually by jumping the connector according to the shop manual.

It showed an MAF fault ( forgot the code on the CE light ). I pulled the MAF and cleaned it withy MAF cleaner. Put it all together and noticed  
the clamp at the intake tubing “after” the MAP was loose, I mean really loose. I snugged that up.

Started the car and ran good but the CEL was still on…Took it for a drive and after about 1/2 mile the CEL went off.

Drove it on a 40 mile round trip speeds up to 70 MPH and no bucking, or CEL lighting up when coming to a stop or at WOT  
( not burning rubber ) in other gears.

Could this be because the engine was pulling in air after the MAF throwing the ECU off as to throwing off the amount of fuel  
to the injectors ? Note: I have the EGR bypassed for 11 years now ( no pinging etc on 87 pump gas )…We have no emission inspections in FL.

Just curious… Have a great day Howie in Eustis Florida.

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**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [May 5, 2013, 10:29am UTC](https://community.cartalk.com/t/1989-mustang-gt-maf-sensor-error-code-fixed/79128/2 "2013-05-05T10:29:57Z")

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@Howie32703 was the code something to the effect that the MAF readings were implausible or out of spec?

A vacuum leak (as you had) would normally generate a lean code.

But I suppose on an early OBD1 vehicle, some kind of a MAF code could be generated.

In any case, congratulations!