1990 GT PROBLEM!!!!

Dsain90GT · Oct 24, 2021

I have 1990 mustang gt and I'll be driving and everything is okay but let's say I'm in 5th gear if I go into neutral to coast the rpm rise to 3k, sometimes even stalls. I bought a new iac and fuel filter and I haven't stalled YET but I haven't drove it much , but it's still rising in rpm to 3k while driving in between shifts or stopping at light . Also if I push the clutch in it stops and rpm goes back down.PLEASE HELP!!!

manicmechanic007 · Oct 25, 2021

Check codes check throttle cable. The TP may be sticking
Doesn't account for the rise
It has no upshift light right?
Has the battery been dead?
The processor may be trying to find Idle speed (relearn)
Warped or cracked plastic intake manifold?
Several problems can cause your complaint

Dan02gt · Oct 25, 2021

Sounds like the neutral sensing switch on top of your transmission is either broken or disconnected.

KRUISR · Oct 26, 2021

Any mods to the car?

Dsain90GT · Oct 26, 2021

No there is no upshift light and yes the battery was dead before I charged it to put in the car

manicmechanic007 said:
Check codes check throttle cable. The TP may be sticking
Doesn't account for the rise
It has no upshift light right?
Has the battery been dead?
The processor may be trying to find Idle speed (relearn)
Warped or cracked plastic intake manifold?
Several problems can cause your complaint

Dsain90GT · Oct 26, 2021

KRUISR said:
Any mods to the car?

No the car is 100% stock to my knowledge

Dsain90GT · Oct 26, 2021

Dan02gt said:
Sounds like the neutral sensing switch on top of your transmission is either broken or disconnected.

Would this cause the car to stall sometimes

Mustang5L5 · Oct 27, 2021

There’s a few things it could be. Bad NGS on top of the T-5, bad VSS sensor as well.

Dump the codes as a starting point. Depending on what the ECU reports will get us started in the right direction, otherwise we are just firing the parts cannon into the dark and taking bets on who get lucky.

1990 GT PROBLEM!!!!

Dsain90GT

Member

manicmechanic007

Dan02gt

mazing how much gas smell came from that tiny hole

KRUISR

Dsain90GT

Member

Dsain90GT

Member

Dsain90GT

Member

Mustang5L5

That is…until I whipped out my Bissell

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1990 GT PROBLEM!!!!

Member

mazing how much gas smell came from that tiny hole

Member

Member

Member

That is…until I whipped out my Bissell

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