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Why is my Cougar running so rough?

I have a 1994 Cougar that has been in and out of the shop for crank no start conditions. Each time it was diagnosed as a fuel problem. The first time the fuel pump was replaced. The second time, a couple of weeks later, he replaced a regulator for the pump. He also noted a lot of junk in the tank. Again a couple of weeks later I had to have it towed back. He didn't charge me and I believe he changed the regulator again both times a used part since a new one was quite expensive. Now the car is running horribly. It's running very rich, with a rough idle, white smoke and a gas odor. I guess at least it starts but I am thinking he doesn't know how to fix this problem. He suggested I drive it around awhile to see if the problem goes away. Does anyone have any ideas?

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  • 271 Answers

Brian, I agree with you, I don't think this person knows what he is doing except costing you money. The white smoke is usually a sign of compression or water going out the tailpipe which would point to a blown head gasket or cracked head, piston something in that area. A couple things you can check to elliminate those problems. Pull your dip stick out and make sure the oil looks good, not foamy, or whitish. Take your radiator cap off and look at your coolant for signs of oil. If you can't see it use a flashlight or stick your finger in. swoosh it around and look for signs of oildbon your finger. If both of these look negative I thing it is either timing or fuel pressure. Call a Ford Dealership and ask for service. Most of them will tell you what the fuel pressure reading should be. On a 94 I believe you still have a throttle body with the regulator built in so you can't get a reading like you can off a fuel rail. It's 1 am and I'm dead tired so I might be wrong on that. The rich fuel smell is just has that is not being burnt and going out the exhaust. If none of this helps you Please find a different mechanic to take it too.. Don't keep driving it like this person suggested or you might really damage something. Good Luck.

Posted on Aug 14, 2019

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Posted on Jan 02, 2017

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mann
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SOURCE: 2004 1.8l nissan sentra what now? not battery or fuel pump/filter

Check your catalytic converter. If you are over 80k miles, these devices will wear in stages. The first stage of wear is slower gear change at cruising speeds when approaching any type of incline. Second stage is the engine light will reveal a faulty oxygen sensor. Because the converter is basically a "filter" built into the exhaust system, it wears by slowly clogging, which leads to no starts, no power, and sometimes a blown head gasket. If your mechanic removed the oxygen sensor before the converter, theres a strong chance it would start right up.

Posted on Jan 06, 2009

  • 1861 Answers

SOURCE: ROUGH IDLE

You have rust particles in the float bowl. The easiest thing to do is remove the side cover of the carb (the thing that unbolts, with a sight-glass on it) and spray carb cleaner into the float bowl until it is clean.

Posted on Jan 12, 2009

  • 1 Answer

SOURCE: 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

Posted on Feb 21, 2009

  • 2 Answers

SOURCE: car has been sitting for awhile--gas tank was less

MASS AIR FLOW OR MAP SENSER

Posted on Mar 04, 2009

jagjeffery
  • 318 Answers

SOURCE: Exhaust smoke - 1994 XJ6 4.0

you have bad valve seals again and it is possible that the valve guides are bad ( to much play ) i worked for Jaguar 13 years and i have done 100's of these and very few needed guides it sound like the seals where not done correctly at the last repair.

Posted on May 29, 2009

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