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Engine playing up when hot?? 

 

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 Post subject: Engine playing up when hot??
Posted: Mon Sep 18, 2006 4:52 pm 
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My mates 1998 falcon ute is missing, starving of fuel or air when hot. Its a I6 auto. Now it only happens when hot and when you give it some stick. It feels like its missing on a few cylinders and the whole car just shakes, it occasionally backfires. The coil was replaced 2 months ago, the air filter plugs and leads were replaced sunday. I did notice that the rotor button is slighty burnt away on the end im not sure but i think this may have something do do with it but the temperature thing may discount that. The distributer cap has been cleaned and no cracks visible. when cold it idles fine and doesnt have this problem.

Any help would be great thanks.
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Posted: Mon Sep 18, 2006 5:56 pm 
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Blown/cracked head :? Only opening up when warm :?

 

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Posted: Mon Sep 18, 2006 5:57 pm 
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I might have thought coil because they sometimes fail when warm, but you have replaced it. Was the coil new or s/h?
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Posted: Mon Sep 18, 2006 6:04 pm 
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TFI perhaps.

 

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Posted: Mon Sep 18, 2006 6:36 pm 
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just changed the spark plugs in mine. makes a fair difference. but sounds more serious

 

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Posted: Tue Sep 19, 2006 8:48 am 
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The coil was new, im thinking head gasket also as is sounds like 2 cylinders missing and only when hot. He bought the car 2 years ago and wasnt sure if the head had been done prior. I told him to have a compression test done and see what happens from there.
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Posted: Thu Sep 21, 2006 12:09 am 
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hey my el sedan is havin the exact problem, runs normal when cold but soon as its warn sounds like a fkn wrx it misses so bad, like its on three cylindars. im thinkin head gasket an gettin it checked out at a mechanics on monday. ive changed ma plugs an leads to but still happens
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 Post subject: Re: Engine playing up when hot??
Posted: Thu Sep 21, 2006 12:38 am 
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joolz wrote:
My mates 1998 falcon ute is missing, starving of fuel or air when hot. Its a I6 auto. Now it only happens when hot and when you give it some stick. It feels like its missing on a few cylinders and the whole car just shakes, it occasionally backfires. The coil was replaced 2 months ago, the air filter plugs and leads were replaced sunday. I did notice that the rotor button is slighty burnt away on the end im not sure but i think this may have something do do with it but the temperature thing may discount that. The distributer cap has been cleaned and no cracks visible. when cold it idles fine and doesnt have this problem.

Any help would be great thanks.
timing is out, carbon deposit crust build-up in combustion chambers clowing red hot causing pre-ignition, clogged injectors causing it to run lean. knock sensor saying, please!

 

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Last edited by Slick on Thu Sep 21, 2006 7:45 am, edited 1 time in total.

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Posted: Thu Sep 21, 2006 12:55 am 
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i'd bet on fuel system. just did the filter in mine, full of s**t. and thats after 70,000ks. after i pulled the plugs, they were white on the electrode. means its running lean. problem is the ecu expects the fuel pressure to always be at 4 bar. as soon as that filter clogs, the computer doesn't know it and doesn't get the required fuel. i knew i had a problem because it took a little long for the revs to drop back after revving it.

i assume its a progressive problem as it gets hotter? if it was sticky valves, timing carbon, or knock sensors you'd expect it to play up as soon as you'd kicked it over.

just check the air and fuel filters first

 

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Posted: Thu Sep 21, 2006 9:22 am 
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I thinks its more than just a fuel filter or timing out. He took it to a mechanic and has had a loan car for two days now. I havnt spoken to him yet but by the looks its the head.
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Posted: Thu Sep 21, 2006 12:38 pm 
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yea i recon check ur fuel filter, or mabe ur fuel pump. my falcon was running like crap and i changed the pump and its all normal again. hope its nothing too seriouse
good luck.
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Posted: Thu Sep 21, 2006 1:24 pm 
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Forgot to add earlier that the fuel filter had been changed 6 months ago but all it takes is some bad fuel with water in it. But that wouldnt explain why its worse when hot, also the fuel pump seems ok as i clamped the return line on the injector rail to boost the pressure and it made no difference. I will let you guys know what it was when he gets it back from the mechanics.
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Posted: Thu Sep 21, 2006 10:26 pm 
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is it prgresive when it gets hot or sudden?

 

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Posted: Fri Sep 22, 2006 10:30 am 
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I'm having an interestingly similar problem with my EF. I've not long had the head done, with a full gasket kit. Previously, due to stuffed head and cracked / leaking intake gasket she was missin like a b**ch. That cleared up after we did the head but a week or 2 later she started playin up again.

Now, when its cold there's no issue. But sometimes, once she's warmed up she'll run rough / miss a bit at idle, especially pulled up at the lights still in gear (auto trans). I was thinkin of replacing plugs/leads for some good quality stuff, NGK plugs, 8-10mm leads, see if that fixes her up. Same bloke who did my head reckons plugs leads MAY be the issue, but isnt sure. He hasnt looked at it yet, was just talkin bout it.

 

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Posted: Fri Sep 22, 2006 10:57 am 
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Starts doing it after about 10 min of driving, basically at running temp. He still hasnt got it back so if its taken 4 days its gotta be bad... bad as in head!!!
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