car not running properly

Asked by May 27, 2010 at 10:33 PM about the 1989 Lincoln Mark VII

Question type: Maintenance & Repair

hey guys i was just wondering if anyone could help me with a problem with my 89 mark..... my car is popping out of the exhaust and pinging aswell.... i have changed the spark plugs and wires, the distibuter, changed the exhaust.. if anyone has any recommendations let me know.  

5 Answers

90

where in the exhaust is it popping ? from the rear tailpipe or in the engine bay ? if in the engine bay, you may need exhaust manifold gaskets + the exhaust "donuts " that join the manifold to exhaust. as far as pinging. start by using up the fuel, adding premium ( despite what factory car sales tell u, these cars need higher octane ) first change the fuel filter and then b4 filling: add a bottle of gas dryer + a bottle of fuel inject cleaner. as far as other pinging. recheck the timing is spot on. otherwise start checking ,smog air check valves located on side of engine near the exhaust ports.

35

Sounds like it is out of time...verify the marks on the balancer haven't "slipped" (5.0L are notorious for this, leading to symptoms such as yours if timed incorrectly). Base timing is 10 degrees factory, with the timing SPOUT connector removed.

1 of 1 people found this helpful.

also could be a burnt or bent valve.

90

along w/ my prior recomm, i totall agree w/ checking balancer / timing. i just went thru that and replaced a module and coil. toss the distribrutor if its old and high mileage. also : is there missing whenthe rpm's increase? thats a sure sign of the above. stever2009

2 of 2 people found this helpful.
235

Do you have a 5.0 H.O. Roller 302 EFI or a regular 5.0 302 TBI ? They do have different firing orders and if it was tuned up recently that may be the problem. And these cars run on Premium 91 octane gas.

1 of 1 people found this helpful.

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