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Location:
Gold Coast
Registered:
October 2002
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18rc idle/rev problems
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Fri, 16 January 2004 04:21
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Hi
Well just after the recent queensland cruise i blew my headgasket. Now this is the second head gasket i have replaced and the first that has had problems with.
The car when cold has a bad miss up through the rev range and the car will backfire out of the carby. when warmed up at idle the car has a lumpy idle and is perfectally smooth just past idle 1200 revs ish right up until 49-5200 revs where it seems to not rev any futher. (like a rev limiter in an efi car).
I can see that the spark is arcing across at the coil was going through the coil to the pos side of the coil. now the coil is replaced it still goes to the pos side but through the rubber from the lead.
also could i have a manafold leak? would this cause my symptons?
and i noticed when i got the manifold gasket there was no separation between the exhaust ports 2 and 3 on the gasket could this be the problem? (the car has extractors)
Any susgestion is appriceated as i am running out of ideas
thanks
Daniel
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Location:
Brisbane
Registered:
February 2003
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Re: 18rc idle/rev problems
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Fri, 16 January 2004 10:12
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| munki wrote on Fri, 16 January 2004 14:21 |
Hi
Well just after the recent queensland cruise i blew my headgasket. Now this is the second head gasket i have replaced and the first that has had problems with.
The car when cold has a bad miss up through the rev range and the car will backfire out of the carby. when warmed up at idle the car has a lumpy idle and is perfectally smooth just past idle 1200 revs ish right up until 49-5200 revs where it seems to not rev any futher. (like a rev limiter in an efi car).
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sound very much like ignition timing is way out (and possibly cam timing tho it should manifest itself regardless of temp).
but it's worth your while checking and gapping all the plugs? or replace them?
| Quote: |
I can see that the spark is arcing across at the coil was going through the coil to the pos side of the coil. now the coil is replaced it still goes to the pos side but through the rubber from the lead.
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is the earth strap from chassis to engine (drivers side) still attached? battery - terminal should connect to chassis next to battery, so for engine to get an earth for spark - it needs the strap between engene & chassis (there's another at rear of gearbox).
also - how old are the plug leads? might be time to replace them - if only to deal with the damage caused by arcing thru the insulation.
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also could i have a manafold leak? would this cause my symptons?
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possibly, tho this manifests itself as piss poor performance, usually when the secondary throttle opens up the engine gets way too much air and stumbles...
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and i noticed when i got the manifold gasket there was no separation between the exhaust ports 2 and 3 on the gasket could this be the problem? (the car has extractors)
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there should be separation between the two ports.
if you have to pull the head off again, get another gasket from autobahn (i got one recently for$15 - Pro-Torque, part JC371)
charles.
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Location:
Rocklea qld
Registered:
February 2003
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Re: 18rc idle/rev problems
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Fri, 16 January 2004 11:00
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id be saying cam timing without actually looking at it. On the 18r's ive notice you could bascially drive with no manifold at all so i dont think a gasket is gonna cause much trouble. Other problem could possibly be you either dodgy head gasket or maybe not tight enough and has basically caused the head to go again straight away.
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Location:
Gold Coast
Registered:
October 2002
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Re: 18rc idle/rev problems
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Sat, 17 January 2004 00:22
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the missing up high was due to faulty points isnt it great when new parts arnt right.
so now apart from the arcing and the idle the car drives fine.
the leads are less than a year old although the metal that connects the coil to the lead is really damaged (looks melted and stuff) so that may be the problem.
could poor earthing cause the car to behave this way? im sure the cam timing is correct etc as the car runs very well apart from this there is no water loss and no oil usage in the past 200km after the gasket has been changed...
perhaps i will do a compression test tomorrow and see if the gasket is not sealing properly.
also i havent checked the plugs but i bet it is the problem they are only 500kms old tho
thanks
Daniel
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Location:
Sydney/Wollongong
Registered:
October 2003
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