Question about 1989 Mercury Cougar

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My 1989 Cougar Ls dies while idleing in neutral and at highway speeds (55+ mph). What are the most likely causes?

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Fuel filter

Posted on Dec 31, 2010

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Go out in AM, car is cold, starts and runs fine. Drive short distance, stop and restart, runs fine, idles fine. Drive about 8 miles at 50-55 mph, pull up at a red light, when speed gets down to ~25-30...


The EGR valve is unserviceable which causes a bad or insufficient fuel control for em-missions......Hope this helps you out........EGR valves are not very expensive.

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Engine dying while running full speed and sometimes at idle. Appears to be an ignition problem. At highway speeds the truck will restart itself while in drive. At slower speeds it has to be put in neutral...


This is an electrical problem, I had this last winter where the car was restarting or the starter was not disengaging. The problem was with the starter. the contacts that meet the plunger in the starter were grooved severely and binded with the contacts.
I had to replace the contacts inside the starter.

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clean the throttle body most common cause of idle/decel die off. its cheap and real cheap and easy to do yourself

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"Humming" or "bearing" type noise in left front at highway speeds


That's a hub bearing. Replace the one that's doing it. I'm assuming this 'roar' is coming from the front, NOT the rear.

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R&R Super Charger Gasket


not hard....the supercharger is basically a simple component.....there is an aftemarket company offering repair parts a lot cheaper than the dealer...sorry don't remember their name....

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1992 olds cutlas cierra stalls after driving over 50 mph


sounds like a fuel problem either a dirt blockage or the computor is mailfuctioning

Jun 05, 2009 | 1992 Oldsmobile Cutlass Ciera

1 Answer

CAR DIED ON HIGHWAY 3 WEEKS AGO GOING 55 MPH .


A lot of things could cause it. The codes need to be pulled first. Most likely the MASS AIR FLOW METER is at fault, but without the codes it's just a guess.

Feb 27, 2009 | 1989 Volvo 240

1 Answer

1994 Cougar XR7 Engine idling rough and running rough at low and


Not saying this for sure, but I had the same problem, and i have a 1994 xr7 V6 3.8 L , and all u need to do is set the idle down manually because your computer could have seen that the injector was stuck open, and tried to turn up idle to keep up with the amount of fuel being pumped, worth a shot :P

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2002 camry battery changed, dies in idle


When you take your battery out and put a new one in all your computer controls have to be reset. You need to drive the car at 55 MPH for 2 min or so, stop, go through normal drive cycle, stop and go and then if it don't straighten out you need to clean the throttle body and the idle air control valve. Hope this helps. PHil

Jan 09, 2009 | 2003 Toyota Camry

1 Answer

1989 Dodge Ramcharger


That could be caused by several things. Is your check engine light on? If it is on it could be due to a number of sensors such as the MAF(mass air flow), MAP(manifold absolute pressure), or EGR(exhaust gas recirculation). However if your check engine light is not on it could be caused by bad plugs and or wires, lack of fuel pressure caused by fauly fuel filter and or fuel pump, or it could be caused by the timing being off a few degree's. Please provide me with the engine size and any work that has been done to that vechile recently to help rule out some of these possibilitys.

Hope this helps for now.

Sep 11, 2008 | 1989 Dodge Ramcharger

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