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cougar won't start

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Mar 16, 2011, 1:38 PM

Post #1 of 4 (5485 views)
cougar won't start Sign In

2000 Mercury Cougar - 2.5L V6- My car was not starting a few months ago and it would start to turn over but never actually start. We took it to a shop and the replaced the fuel filter and changed the oil (because I flooded it by starting it 50 times) and it started working. It worked fine for 2 months and started having the same issue a week ago. I only started it 3 or 4 times this time. When the tow truck showed up to take it to the shop again it started (about 2 days after trying to start it). Once started it runs fine. It still starts 3 days later like no problems. I was getting a 0430 error which is the bank 2 cat or the o2 sensors but that it no long showing as a code now that the car is starting. I am wondering if the cat is hollowed out and causing flooding or if it is just the o2 sensors. I think something is flooding it but cannot figure out why. Any thoughts?

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zmame profile image

Mar 16, 2011, 3:18 PM

Post #2 of 4 (5477 views)
Re: cougar won't start Sign In

unfortunately converters are common to go on the 2.5L 6cyl may be moving around working part of the time and not others and there is a potential it could plug. You will need converters and they are absolutely ignorant to change even with the right tools and a hoist.

Flooding issue:

I would check air box/filter, clean mass air flow sensor(spray some break clean on it don't touch the wire.) Check you plugs and make sure they are Motorcraft plugs. Probably wouldn't be a bad idea to change them anyways.

is the P0430 the only code you got?

(This post was edited by zmame on Mar 16, 2011, 3:22 PM)


Mar 17, 2011, 5:12 AM

Post #3 of 4 (5468 views)
Re: cougar won't start Sign In

You have to test when car will not start.check fuel pressure/spark/injector pulses is accessable with a noid light or a touch probe.have to confine to a particular system then you can isolate from there.if excessive backpressure is causing no start then remove front 02 sensor and see if it will start....sometimes enough by doing this car will need to have more information for you know how many things that can cause a no start let alone a intermittent.


Apr 15, 2011, 10:21 AM

Post #4 of 4 (5408 views)
Re: cougar won't start Sign In

the were likely caused from the raw gasses in the converter when its flooded..shouldn't be a worry there but the next time the vehicle don't start pull off any plugwire andcheck for spark at the wire end by putting a screwdriver in the end and holding it about 3/8 in.from a good ground while someone else is cranking the engine, make sure you you con't come in contact with the spark if there is one.if theres good spark there suspect a fuel pump..try taking your hand and banging on the tank again while someone is cranking it..usually it will jar the pump enough to get it running and get to a shop to replace...good luck


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