T O P I C R E V I E W
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East Bay 50
Member # 8081
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posted
So after multiple attempts with changing distributors. My car keeps retarding. Once its set it will be good for a few weeks but then it does the same thing again. Has anyone ever had this problem? This is on a 91 mustang with a 347 if it matters
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OneFastHatch.
Member # 9537
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posted
Timing chain?
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norcalfiddy
Member # 11207
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posted
Is it moving?
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5.SL0W
Member # 9987
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posted
sounds like a bad distributor gear
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East Bay 50
Member # 8081
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posted
Dizzy gear is new. Timing chain is new too.
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Greasy
Member # 5258
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posted
Happened to a buddy of mine, the bolt that holds the timing gear onto the cam was loose.
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FASTHATCH 925
Member # 7277
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posted
Have someone that know what there doing to work on it there's lots of thens that can make happen [ December 29, 2012, 05:59 PM: Message edited by: FASTHATCH 925 ]
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Ricks Hot Rod Lincoln
Member # 7637
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posted
I have three possible answers: I have the same issue on my 1990 Lincoln Mark VII (It is a Fox Chassis) that I converted to Mass-Air when I put in my 342 (It's a standard bore stroker) I have the C3W1 ECU Ford : F3ZF-12A650-FB that is a Ford replacement ECU and used in the 1993 Mustangs. When I had a chip burned for my car tech said for has some ECU's that mess with the timing and causes the timing to change.
My second suggestion is: Is the outer ring on the harmonic balancer slipping? If you haven't checked this. Here is the way to do it. Pull the #1 spark-plug out, insert a wooden dowel and hand crank the engine to top dead center and When the dowel stops moving, make a mark on the balancer. Continue to rotate the crank by hand and when the dowel starts moving down, mark the balancer again. TDC should be in the middle of those two marks, or very close. if it isn't, your ring might be slipping and giving you a false reading. Lastly, did you relocate your air charge temp sensor from the intake manifold to the cold air intake to send the ECU a false reading? I wonder if this is my issue to. This is just a theory... LMK if any of these help, Rick Plan D: do you have a boost retard unit that pulls timing as your boost rises? MAP/BAR sensor bad? [ December 29, 2012, 11:36 PM: Message edited by: Ricks Hot Rod Lincoln ]
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Ricks Hot Rod Lincoln
Member # 7637
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posted
Crap, now I thought of another... Did you install a aftermarket oil pump drive that is heavy duty like what ARP sells? You do know you need to trim off about an 1/8-3/16" off the bottom of the dizzy shaft so you don't force the drive down into the pump. and as the engine runs, the dizzy is able to drop down further into the engine changing your timing. I learned this lesson the hard and EXPENSIVE way...
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East Bay 50
Member # 8081
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posted
I just reset it to 10 btdc to get it to run corretly again. But hotrod ric suggested some interesting possibilities. Thanks guys. Ill let you guys know what i find
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turbo50
Member # 6700
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posted
Is ur check engine light still fuctioning? [ December 30, 2012, 10:37 AM: Message edited by: turbo50 ]
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turbo50
Member # 6700
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posted
Here is a good read:
http://eectuning.org/forums/viewtopic.php?t=4245
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East Bay 50
Member # 8081
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posted
quote: Originally posted by turbo50: Is ur check engine light still fuctioning?
The cel has not worked in 20 years lol
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turbo50
Member # 6700
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posted
quote: Originally posted by East Bay 50: quote: Originally posted by turbo50: Is ur check engine light still fuctioning?
The cel has not worked in 20 years lol
Hahhahaha
well let us know what you find when you fix it.
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Ricks Hot Rod Lincoln
Member # 7637
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posted
After reading Turbo 50's link he included, maybe your Air charge sensor in the #5 runner is intermittently bad? Less that $15 at O'Reily's. It was my third theory in my first post. And it does retard spark...
http://eectuning.org/forums/viewtopic.php?t=4245 [ December 31, 2012, 04:01 AM: Message edited by: Ricks Hot Rod Lincoln ]
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89Rodknocker
Member # 2951
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posted
Its probally not the case but ive seen the oil pump starting to lockup causing the dist to move untill it eventually turns the oil pump rod into a curly fry then snap.
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4IDFOX
Member # 9921
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posted
Two questions. Do you have a hv oil pump ? Is the dist. hold down clamp chrome ?
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SLOWSN95
Member # 8269
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posted
Do you have a stock cam?
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turbo50
Member # 6700
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posted
I'm sure it is mechanical and either dizzy gear, cam gear, or oil pump related.....but it hasn't died yet lol
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JohnB
Member # 969
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posted
What is the condition of the distributor gear?
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Sikwidit-blumaxx88
Member # 11046
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posted
quote: Originally posted by Ricks Hot Rod Lincoln: Crap, now I thought of another... Did you install a aftermarket oil pump drive that is heavy duty like what ARP sells? You do know you need to trim off about an 1/8-3/16" off the bottom of the dizzy shaft so you don't force the drive down into the pump. and as the engine runs, the dizzy is able to drop down further into the engine changing your timing. I learned this lesson the hard and EXPENSIVE way...
How true is this I just installed a new oil pump and I'm haveing a similar issue????
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