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Andy, Shop Owner/Mechanic
Category: Car
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Experience:  2 year as Automotive Repair Shop Owner and Mechanic, Throubleshooting and Diagnostics
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94 Lincoln: dohc..rough idle..acceleration..torque..1500-2000 rpm

Resolved Question:

94 Lincoln 4.8 Lt DOHC, Runs with an extremely rough idle. Has little acceleration or torque.
Idle smooths out with 1500-2000 rpm. Engine seems to sound normal. Removed plugs, pass.side all 4 dry fouled/drivers side o.k. Engine light is staying on as well. What checks can i make to determine my problem or problems? Thanks,J.R.
Submitted: 4 years ago.
Category: Car
Expert:  Andy replied 4 years ago.

Hello J.R.,

My name Andy I will try to help with your problem.

 

First, I would scan check engine light code (please post for me), your car is OBD I more than likely so you will need to found some shop who can scan OBD I codes. Your local auto part stores like Autozone or Checker may not be able to.

Second, Look for simple staff like vacuum lines broken or misplaced or disconnected.

Also what spark plugs did you use, I would recommend use Motorcraft and set check GAP.

 

Thank you,

Andy

Customer: replied 4 years ago.
Vacuum lines are o.k. I used autolite plugs, gapped at 54. Can i read codes myself without a scanner? What check is best in checking timing chain for a possible jumped tooth?
Expert:  Andy replied 4 years ago.

you need a scanner to read the code, on cars prior to 1996 you will need more than likely will be OBD I system, ask local stores or shop I think Meineke offer no charge code read, with a code much easier pin point the problem. I wouldn't use Autolite plugs for any cars, On my experience number 1 in fail as far as quality, usually if I write tune-up on any car I only use OEM brands and OEM plugs this is insure of any failure and other problems in feature. I don't see a timing issue at this time. Check IAC (Idle Control Motor) located on throttle body. Possible failure if it get stuck full open. You can take it off and cleaned. If fix problem replace IAC. But try scan car first, and tell me the engine code, I will help you to pinpoint father.

 

Thank you,

Andy

Andy, Shop Owner/Mechanic
Category: Car
Satisfied Customers: 47
Experience: 2 year as Automotive Repair Shop Owner and Mechanic, Throubleshooting and Diagnostics
Andy and 13 other Car Specialists are ready to help you

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Andy
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2 year as Automotive Repair Shop Owner and Mechanic, Throubleshooting and Diagnostics