Missfire! HELP!
27-01-2010, 03:40 PM
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Missfire! HELP!
Car been in bodyshop for like 3 weeks, went in running fine, seen it more or less every day. Its not been driven apart from being fired up just to drive from ramp to ramp. Battery was dead this morning, fired it up earlier to bring it home and she's developed a missfire from the word go.
Nothing out of place, idles o.k. after it warms up, but when you blip the throttle the usual staggering air leak type of sound is heard, more noticable round exhaust. Plugs and leads are o.k....any ideas???
Nothing out of place, idles o.k. after it warms up, but when you blip the throttle the usual staggering air leak type of sound is heard, more noticable round exhaust. Plugs and leads are o.k....any ideas???
Last edited by COCHYN; 27-01-2010 at 03:43 PM.
27-01-2010, 03:50 PM
#4
They will look fine i lost count how many times my cossie's & rs turbo's done this.Its about time you got the coil pack conversion anyway its the only way to go on them totally transforms the car. Is that it finnished in the bodyshop? pics if it is
27-01-2010, 04:25 PM
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AS ABOVE CHANGE THE PLUGS BEFORE YOU DO ANYTHING, THEY'VE PROBABLY STARTED IT MOVED IT AND IT'S NEVER COME OFF OF CHOKE SO THEY'D BE FOULED UP
just noticed caps lock was on and couldnt be bothered to re write
i'm not shouting at you
just noticed caps lock was on and couldnt be bothered to re write
i'm not shouting at you
27-01-2010, 04:29 PM
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Yes you are, cruel f*ck 
O.k so I'm gonna take a stab at guessing this is a common thing if a Cossie's been fired up once or twice, switched off immediately after moving and left for a couple of weeks then?
I would have thought driving would be enough to clear the plugs
O.k so I'm gonna take a stab at guessing this is a common thing if a Cossie's been fired up once or twice, switched off immediately after moving and left for a couple of weeks then?
I would have thought driving would be enough to clear the plugs
Last edited by COCHYN; 27-01-2010 at 04:33 PM.
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27-01-2010, 04:42 PM
#8
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Dont change the plugs....just clean them.
likely just fouled from being started on cold start, stopped before it gets a chance to heat up or taken for a blast to clean the plugs up...
driving sometimes is enough, but if that cylinder isnt firing, it cant clean the plug..
likely just fouled from being started on cold start, stopped before it gets a chance to heat up or taken for a blast to clean the plugs up...
driving sometimes is enough, but if that cylinder isnt firing, it cant clean the plug..
27-01-2010, 08:57 PM
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Not sure, after doing the plugs and fitted the panels back onto the car etc. I just couldn't be bothered with it afterwards. Will check it tomorrow with a fresh head 
Need more suggestions though people
Need more suggestions though people
27-01-2010, 09:06 PM
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hay up cochyn yep i would say plugs ive been through about 4 sets of plugs so far and thats from just setting the engine up i find once the plugs get wet thats the end of them bassicaly
27-01-2010, 09:09 PM
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thinking on that is its not that check all the power leads to the the coils etc etc had mine being mapped the other day was fine untill u hit ariund 5000 revs under load and then missfiring slightly turned out the power to my edis and coilpack was only at 12.8 when it should have been in the 13's
27-01-2010, 09:17 PM
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Hmmm, best inspect that tomorrow then. Its just strange all of a sudden its happened, its been inside the garage for 3 weeks without any issues...grrrrr!!!!
28-01-2010, 12:30 AM
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What plugs are in it? If they are iridiums, once they're fouled they're fucked. If they're 071cs then clean them by dowsing the end in carb cleaner and setting them on fire, you need to burn the contamination off! Chuck them back in and try again.
Did they need to touch anything in the engine bay in the bodyshop? Would they have any reason to disconnect earth wires etc.?
Did they need to touch anything in the engine bay in the bodyshop? Would they have any reason to disconnect earth wires etc.?
28-01-2010, 11:49 AM
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Nah, no reason to play with earth wires apart from disconnecting the main battery terminals when welding the rear quarter panel. Plugs are 71C's and there's just no other way they can be cleaned any more than I have. Checked injectors, not much change from removing plug off number 3 so will need to try another L8 ECU.
28-01-2010, 12:01 PM
#20
so you ask for help,,,, several people tell you to change the plugs,,,,,, you havn't changed them butare still asking for help 
for the price of a set of plugs why not change them,,,,, i've seen loads of cars where the plugs look ok but there not.
have you checked the flux capicitor? mave have overspray on it causing a short
for the price of a set of plugs why not change them,,,,, i've seen loads of cars where the plugs look ok but there not.
have you checked the flux capicitor? mave have overspray on it causing a short
28-01-2010, 12:10 PM
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No I appreciate the advice, but I've changed them for a 2nd set and cleaned the existing low millage one's. No difference, hence why I'm looking into it further.
28-01-2010, 01:22 PM
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New 71C's, no difference. I need to borrow an L8 ECU to ensure its not that. Anyone?
Last edited by COCHYN; 28-01-2010 at 01:24 PM.
28-01-2010, 06:18 PM
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ECU was connected when welding, hence why I'm considering the ECU. Anyone able to lend me one before I buy one, PLEEEEEEEEEEASE!!!!!
28-01-2010, 06:33 PM
#34
Ginger bollocks i know too many people who have had fooked cars and swapped shit over and ended up with 2 fooked cars. a mate did that and i ended up towing with a transit all the way from chester to warrington the back way the previously mint car to camco 88 in warrington where they unlocked the ecu and charged a whopping Ł350 sovs (plus vat) for the pleasure
otherwise i would of said borrow me ecu
best of luck but i reckon its probably summat daft if its not used any water,they can lose water and give a misfire as the water goes into the bore and out and won't fire ion that cylinder,i have seen it squirt out when i took the plug out to check for sparking
the previously mint car to camco 88 in warrington where they unlocked the ecu and charged a whopping Ł350 sovs (plus vat) for the pleasure otherwise i would of said borrow me ecu
best of luck but i reckon its probably summat daft if its not used any water,they can lose water and give a misfire as the water goes into the bore and out and won't fire ion that cylinder,i have seen it squirt out when i took the plug out to check for sparking
28-01-2010, 08:18 PM
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Nothing out of the ordinary guys, everything tested and working as it should, but a few things point towards the ECU. I need to borrow one to confirm it.
