1991 Ford Mustang

ICEMAN27573

MEMBER
1991 FORD MUSTANG
4 CYL
2WD
AUTOMATIC
236,000 MILES

Started my car this morning realized I forgot something. Then when I turned the ignition swith I hear a knock and the engine want start. Take the ignition module(less than one week old) to get it tested and it fails. Get another one at a different store install it turn the swicth, knock followed by slight backfire engine doesn't start. Checked the timing belt and was able to slide it off without loosening the tensioner but it seemed to still be alligned. Line up timing marks install a new belt with about 1/8" to 1/4" of slack. The knock is still there and engine wont start. Could this be related to the computer or starter?

Wednesday, January 14th, 2009 AT 6:23 PM

3 Replies

DAVE H

MECHANIC
13,384 POSTS

You will need to check compression. May have bent valves.

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Wednesday, January 14th, 2009 AT 6:59 PM

ICEMAN27573

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3 POSTS

Found the problem the aux. Shaft sprocket was not in the right spot. Haynes repair manual had no information about where it needed to be. Still not sure it is in the right place, but the car is running with just a slight hesitation when acellerating from a dead stop. Thanks for your help.

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Thursday, January 15th, 2009 AT 12:07 AM

DAVE H

MECHANIC
13,384 POSTS

AUXILIARY SHAFT & BEARINGS
Removal
Remove timing belt. See TIMING BELT in this article. Using dial indicator, check auxiliary shaft end play.
End play should be .001-.007" (.02-.18 mm). If end play is not within specification, replace retaining plate. Remove auxiliary shaft sprocket and auxiliary shaft cover. See Fig. 5.
Remove retaining plate. Remove auxiliary shaft. Use care not to damage bearing surfaces. If removing auxiliary shaft bearings, use slide hammer and Puller (T58L-101-B) to remove bearings.
Inspection
Inspect components for damage. Check auxiliary shaft-to-bearing clearance. Clearance should be .0006-.0026" (.015-.066 mm). Replace components as necessary.
Installation
To install, reverse removal procedure. Use driver to install bearings. Ensure bearing oil holes align with holes of cylinder block. Coat auxiliary shaft with engine oil before installing.
Tighten bolts to specification. See TORQUE SPECIFICATIONS table at end of article.