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Location:
Adelaide
Registered:
January 2004
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18R-C problems - any ideas
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Sat, 09 April 2005 05:08
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I've been having some problem with this engine for about the past 18 months or so but in the last month they got even worse and no one I know can figure out why.
It all began with the odd carby backfire when the car was cold.
To try and stop this I've rebuilt the dizzy, put on a new dizzy cap and spark plug leads. This didn't fix it.
I found a leak in the vacuum booster, so I fixed that, but it still didn't fix the problem.
Then I thought the carby might have been making it run lean, so I rebuilt that and cleaned all the jets etc, but it diddn't fix it!
I've checked everywhere else for vacuum leaks using some aerostart, but I can't find any.
The carby backfire has got more regular lately, and now when I switch the car off it runs on for about 1 or 2 seconds, then stops and about 1 or 2 seconds after it backfires out the exhaust, especially if you turn it off as soon as you stop.
The timmings all correct for the engine and I check it everytime I service it. I had other people check it, so it's not that I'm setting it wrong.
Also, lately, it been making a heap less power, and it's turning into a shit to drive.
Any ideas that anyone has would be heaps heplful. I'm gonna do a compression check on it once I can get my mates guage.
If anyone wants to see a vid of the carby backfire give us your e-mail and I'll what I can do. It's pretty cool, cause if you take the air cleaner off it shoots flames about a foot in the air!
I forgot - it's running a weber DGV off another 2L and its had all the jets changed by a professional carby place to match the 18R
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Location:
BRAY PARK BRISBANE
Registered:
March 2005
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Re: 18R-C problems - any ideas
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Sat, 09 April 2005 06:22
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Don't know what the problem is but if i did i could stop mine from backfiring every now and again. sounds like a gunshot scares the shit out of me  . have had it sugested to me it might be caused by an exhaust leak (ive got a bad one have you got a exhaust leak?) causing it. 
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Location:
Land of Oz
Registered:
June 2004
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Re: 18R-C problems - any ideas
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Sat, 09 April 2005 06:53
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Hi,
Have you checked your plugs? What state are they in?
If the cylinders have carbon deposits in them, they can cause the engine to run on a bit after you've turned it off. This is because the carbon deposits are glowing from the engine being used and they are hot enough to ignite the mixture (without the sparkplug) when you turn off the motor.
If you start the engine and let if run for only a very short time (ie not up to temp) and turn it off, does it still run on? Or does it run-on only after it's been running for a while and the engine is hot? Usually, if you have some carbon deposits they run-on after the engine is hot. The best and cheapest way to get rid of the carbon deposits is to give the car a good run and let the engine rev pretty high to "burn and blow" the carbon out of the cylinder.
I'm not sure about the 18R-C, but the 18R-G has a air-bypass (or something like that) solenoid that does something when you turn off the engine. It allows extra air into the carbs or something like that to stop the engine running on. I'm sorry I can't be more specific than this. It once broke on my car and the engine would run on a bit until the solenoid was replaced. I should really do some investigation to find out exactly what it does and how. In any event, if the 18R-C has something like this, then maybe it needs to be checked also.
Also, I'd check your compression in case you've got a sticking inlet valve. The only way something is gonna blow out of your carby is if the inlet valve is open when there's an ignition occuring in the cylinder.
seeyuzz
river
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Location:
Perth
Registered:
May 2003
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Location:
Canberra
Registered:
February 2004
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Re: 18R-C problems - any ideas
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Sun, 10 April 2005 01:46
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Check your cooling system for overheating, this might cause the engine to continue ideling but not the backfire on startup.
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Location:
Adelaide
Registered:
January 2004
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Re: 18R-C problems - any ideas
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Sun, 10 April 2005 23:15
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Early rolla - sounds the like the problem is the timing chain, cause your spot on with it having shitty oil pressure at idle, and you can actually hear the timming change now I think about it 
I had a feeling this might have been the problem but my dad keep saying it wouldn't be that bad.
Guess I'll have to pull out the reciepts and find out when they last got changed.
Thanks for all your help guys! Hopefully I'll get it fixed now and I won't keep getting shitted all over at the lights by 202 commonwhores
Maurice C : Cooling system is fine, never had a problem with it, unless I get stuck in traffic for more then 5 minutes on a 40 degree day
81lowlux : yeah, got an exhaust leak, but thats just cause when it backfired one day it blew some of the exhaust putty out the flanged between the manifold and the front pipe 
And if anyones interested the weber came off a corsair, or soemthing like that I think. It's a manual choke anyway, so they never came out on any Aussie car
[Updated on: Sun, 10 April 2005 23:22]
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Location:
Canberra
Registered:
February 2004
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Re: 18R-C problems - any ideas
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Mon, 11 April 2005 03:29
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How does a worn timing chain cause low oil pressure at idle? I reckon that the timing chain needs attention in my 18r-c because it seems to rattle under load( Around 2000-2500 in a high gear or uphill) and oil pressure seems to flucuate a bit as well as been low at idle. I know that the middle gear drives the oil pump and dizzy, but this would have to turn at the same speed even if the chain was worn. Thanks guys.
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Location:
Perth
Registered:
May 2003
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Location:
Canberra
Registered:
February 2004
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Re: 18R-C problems - any ideas
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Mon, 11 April 2005 23:59
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Pretty good reply. The only problem with changing the timing chain adn gears is that they cost about 300 bucks I think which is about six times the price that am 18r-c is worth in good condition. decisions decisions.
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Location:
Adelaide
Registered:
January 2004
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Re: 18R-C problems - any ideas
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Tue, 12 April 2005 03:10
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| Maurice c wrote on Tue, 12 April 2005 09:29 |
The only problem with changing the timing chain adn gears is that they cost about 300 bucks I think which is about six times the price that am 18r-c is worth in good condition. decisions decisions.
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Not true, priced some this morning. There about $300 form toyota (thats what the reciept from '92, when mine where last done, added up to).
At sprints a kit with all tensioners, chains, and guides was $115 for an 18R and $100 for an 18R-GEU.
I don't see the point of going guenuine on suhc an old engine that only needs to last me another year or two before I upgrade.
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Location:
Adelaide
Registered:
September 2003
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Re: 18R-C problems - any ideas
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Tue, 12 April 2005 04:10
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lachie what came in the kit for the 18rg?
chains wouldn't be that much but do they have generic guides for the g as well? as chains and dampners?
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Location:
Adelaide
Registered:
January 2004
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Re: 18R-C problems - any ideas
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Tue, 12 April 2005 04:51
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It wasn't actually a kit for the 18R-G, but for the $100 bucks you got all the chains, tensioners and guides. Sprint at golden grove sai they could get them within a day
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Location:
Canberra
Registered:
February 2004
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Re: 18R-C problems - any ideas
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Sat, 16 April 2005 06:17
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Price the same stuff in Repco and prepare to s##t yourself.
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Location:
Adelaide
Registered:
September 2003
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Re: 18R-C problems - any ideas
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Sat, 16 April 2005 07:22
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i am in the process of getting a quote from sprint, will repco frighten me or attract me to them in an unnatural way...i am guessing i will be frightened as i still find sprint cheaper that autopro/repco/superuseless
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Location:
Canberra
Registered:
February 2004
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Re: 18R-C problems - any ideas
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Wed, 20 April 2005 00:38
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I've never heard of Sprints. I'm in teh ACT and in Repco that quoted me 180 for two chains and two tensioners. Without gears. If you can get a whole set for 115 your doing pretty well. Buy two.
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