Excellent Mustang "FIX" Post (true classic!)

[PKRWUD]

This is one of my favorite “FIX” posts from that network I belong to. It was emailed to me about a year ago, but I thought you guys (and gals) would get a kick out of it. The Original Message and the Test and Repair Data were in the first email, asking for assistance. The Update followed a couple days later, and the Fix followed a couple days after that.

Enjoy.

From an iATN email:

Ford-Drive: 90 Ford Mustang GT, Poor-idle/Misfire

1990 Ford Mustang GT 5.0 L

Trans: Standard
Mileage: 80,000 mi
VIN: 1FACP45E6L
Fuel: EFI
Ignition: Dist
Emissions: OBD1

Symptoms: Poor Idle Quality, Misfire
Occurs: Always

________________ ORIGINAL MESSAGE ________________

After cust. installed plugs and wires, this Mustang runs rough at idle.
Checked plugs; ok, check firing order; ok, fuel pressure in range. Cust told
me he had a vac leak before, so went looking for that; none found. Motor
seems stock and car very clean. He did tell me it has been starting to run
rougher lately. I pulled injector connector off (the one I could get to) and
no idle change. Have inj. pulse. Do these things clog? Above idle (1500 and
up), no noticeable miss. I'd like some Mustangers input. Thanks Charlie

_______________ TEST AND REPAIR DATA ______________

Checked for codes and none were found.

RELATED REPAIR HISTORY

Owner installed Split Fire plugs and 8mm Accel wires


___________________ UPDATE ____________________

Thanks to all who responded. Well it was back to work after a day off. Went
back to basics on this Mustang. Did a compression test; found #7 cyl. dead
(odd with only 80k on it). Spoke to owner on what he'd like to do; he said
he might look into a crate engine from Ford Motorsports. Well I guess you
can't forget basics on engines with under 100k on them! Thanks again Charlie

______________________ FIX _____________________

Hi all, Posted an update, but here’s the fix: Cust ok'd a tear down. You
would not believe what I found!; one of the air box hold down clips made
it's way to the #7 cyl. intake valve, holding it open! Here’s something
somebody could market! Maybe some company out there should come up with a
screen to cover the tb. Thanks all who wrote Charlie


Charlie Nxxxxxx
Technician
Txxxxx Sunoco
Txxxxx, New Jersey, USA

Take care
~Chris


------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

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