Question about 1995 Lincoln Mark VIII

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Intermittently wont start,

Ford dealer suggested the IAC valve, replaced and seemed to fix the problem for 8 months, then again same problem.Computer stores no codes and everything checks out ok. Replaced IAC valve again, gave some relief for a month and again same problem. Check engine light does not come on. Will start right up after car sits for a while. very unpredictable.

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  • golddee Sep 02, 2008

    93 lincoln mark viii hard to start runs with a skip then rpm drops down car cuts off . the only way to keep running is to hold gas pedal at 600 -700 rpm and even then car has a skip to it like it is back firing. Checked for vaccum leaks and found none.


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I had the same problem with my 1995 Mark VIII. the problem turned out to be a combination of plugged fuel filter and the sock filter in the fuel tank. when the car sat for a while the sediment blocking the sock would fall off the sock filter in the tank, but once you start driving it will pick it back up and block the pump from retrieving enough fuel.

Posted on Oct 04, 2008

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My 04 Jeep GC is idling around 500rpm in Drive and Reverse. I had the IAC valve replaced after it was doing this about a month earlier, and it seemed to be the problem...until yesterday. The idling

it could be a new bad IAC motor...especially if its an aftermarket brand!! something like that even though the part is a little more expensive go with OEM jeep parts, especially electrical stuff.

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It can be issue with IAC( idle air control valve) causing the problem.

There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

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2 Answers

We have a 2003 ford explorer and it periodically doesnt start. Sometimes the engine will turn over just fine and sometimes it does nothing. We have had it to the dealer several times over the past three...

Note the type of conditions that this happens in like high humidity,rain completely dry or does any of that make a difference? I would suspect a faulty crankshaft position sensor that is possibly cracked or corroded wires to it. If there is oil leaking onto the plug occassionally this can disrupt the signal as well.

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After starting it will idle down.......during the day at intermittent times the idle surges then it will stop.i start again.fine for a while then the idle surges stalls....happens all day.....driving me...

Sounds like a Dirty IAC ( idle Air Control ) on the back of the throttle body.

You will need to remove the plastic throttle body cover to see it, it is mounted on the back


2 8mm bolt head ( actually sheet metal screws that have hex heads ) and it will come off.

Take a look at the plunger inside the IAC, to see if it is gummed up, Some throttle body safe Throttle body cleaner should do the trick ( I used 90% isopropyl alcohol and Q-tips to clean mine on my 2001 ).
It should look like this when clean

I replaced mine after the 2nd time is gave me grief ( seems to happen more often once it starts ) and it was ~ 70.00 at one of the Ford dealers that sell parts online ( tasca ).

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Car idles hard when i stop at traffic lights or slow down.. i recently had the check engine light come on and the dealer changes the egr selenoid and valve.. but problem persist and is intermittent


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As the post said earlier they went to a ford shop.... I suggest to have your vehicle inspected elsewhere. maybe have your o rings replaced and your fuel system cleaned.

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one of the most likely causes would be your iac valve sticking. you can pull it off and clean with carb cleaner. it will be bolted on air intake close to throttle plate two 8mm bolts it will have a little motor housing coming out of it.

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I have a 2000 Sonata V6 with the same issue (low speed intermittent stalling). Finally found a Hyundai dealer that knew about the issue and replaced the CRANK SENSOR. This has dramatically reduced the stalling but it still occurs very rarely. I think the engine idle speed of my car is abnormally low and this may be a secondary issue not completely related.

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