4k Detonating

[rolla rookie =D]

hey all just got a little problemm with my 4k which is becoming very anoying,

evry time i turn the key off the engine keeps trying to run on me (detonating) and the temp guage never goes past half way.

 

I'm baffled to what could be causing it to detonate ,could it be something to do with the ignition system or the fuel?

 

any help apreciated .

 

cheers -jake :dance:

[Evan G]

hey all just got a little problemm with my 4k which is becoming very anoying,

evry time i turn the key off the engine keeps trying to run on me (detonating) and the temp guage never goes past half way.

 

I'm baffled to what could be causing it to detonate ,could it be something to do with the ignition system or the fuel?

 

any help apreciated .

 

cheers -jake :dance:

 

what fuel you running? you should be running a minium of 95 octane

timing? should be between 8 and 15 degrees advanced

 

 

also check the fuel cut solenoid on the side of the carby, get someone to turn the ignition on while you listen to the carby, you should hear a click

 

I'm not really sure how they service the solenoid? remove clean and refit?

 

 

or if its a manual just put the handbrake on and drop the clutch in 4th :y:

Edited January 17, 2010 by Evan G

[rolla rookie =D]

what fuel you running? you should be running a minium of 95 octane

timing? should be between 8 and 15 degrees advanced

 

 

also check the fuel cut solenoid on the side of the carby, get someone to turn the ignition on while you listen to the carby, you should hear a click

 

I'm not really sure how they service the solenoid? remove clean and refit?

 

 

or if its a manual just put the handbrake on and drop the clutch in 4th :dance:

 

I'm running just normal 91 octane unleaded and 15 degrees timing , but already tried changing the timing to 8 and made no diff.

 

although i have had a bit ov issues with the fuel cut off solenoid, so i blocked it off so maybe a new one ov those will do the trick.

 

thanks mate

[Evan G]

what fuel you running? you should be running a minium of 95 octane

timing? should be between 8 and 15 degrees advanced

 

 

also check the fuel cut solenoid on the side of the carby, get someone to turn the ignition on while you listen to the carby, you should hear a click

 

I'm not really sure how they service the solenoid? remove clean and refit?

 

 

or if its a manual just put the handbrake on and drop the clutch in 4th :dance:

 

 

I'm running just normal 91 octane unleaded and 15 degrees timing , but already tried changing the timing to 8 and made no diff.

 

although i have had a bit ov issues with the fuel cut off solenoid, so i blocked it off so maybe a new one ov those will do the trick.

 

thanks mate

 

leave it on 12 and use 98 or 95 and your problem will go away,

 

i remember i was short on cash a week so i put 91, ran like shit, randomly pining and detonation

 

running 98 and never had a problem since :y:

 

 

wait so your removed and blocked the solenoid? so whats surpose to stop the engine from pumping fuel in when ignition is off?

Edited January 17, 2010 by Evan G

[rolla rookie =D]

leave it on 12 and use 98 or 95 and your problem will go away,

 

i remember i was short on cash a week so i put 91, ran like shit, randomly pining and detonation

 

running 98 and never had a problem since :y:

 

 

Alright man ill give it a go when i go to fill up next ,may get a lil expensiv tho :dance: haha

 

if it still does it what would u think the causew would be ?

i can smell fuel fumes too when i put my foot into it my missus hates it haha.

 

oh and just a quick edit it did the same thing with the solenoid in but made the car run worse so it may be the solenoid

Edited January 17, 2010 by rolla rookie =D

[altezzaclub]

Usual cause is timing too advanced, occasional cause is being too hot (are you sure your temp gauge is correct?) or a lean mixture, or low-octane fuel, or a carboned up motor.

 

The fuel shut-off solenoid is definately a likely factor I think, otherwise they wouldn't have bothered to fit one at the factory.

 

You can build a knock detector for a handful of bucks-

 

http://autospeed.com.au/cms/article.html?&A=0353

 

When can you smell fuel? When you're driving or when you turn the motor off and get out?

[baggus]

Mine does it to, believe it's called diesiling?? Was told it's from a incorrect mixture and idle being to high

[Evan G]

^^ thats from to much carbon deposits in your combustion camber, so when the engine is off the carbon gunk is hot enough to ignite the air/fuel mixture

[irokin]

^^ thats from to much carbon deposits in your combustion camber, so when the engine is off the carbon gunk is hot enough to ignite the air/fuel mixture

 

Yes and thats what this guy is describing, not detonation, hes just got his terms mixed up.

[jono1986]

Hate to steal the thread a little bit, but with this fuel cut off solenoid it stops fuel from entering the engine when the igntion is switched off. My question is i'm about to put a weber carby on my 3k, and it doesn't have a fuel cut off solenoid, do i need to bother if the mixture, idle and timing are all correct?

[rob83ke70]

if your idle speed is too high it will run on upon turning the ignition off.

 

carbon in the engine can cause this, lean air fuel mixtures at idle, combustion chamber temperature too high, or too far advanced timing. I'd run 8-10 degrees timing, and 91 octane fuel should be fine. If it still runs on with that, you have another problem.

 

Go to a subaru dealership, and buy a can of "subaru upper engine cleaner" and spray it down the carburettor throat, half the can with the engine off (at operating temperature) and the other half the can with it running just fast enough not to stall. Basically as per the instructions on the can.

 

Set the timing, set the idle speed, make sure your manifold bolts and carburettor bolts are tight, and that your cooling system is working well. If there is any doubt about the cooling system then run a chemical flush through the system, and make sure your radiator is clean and your thermostat works.

 

Robert.

[philbey]

You won't need the solenoid with the weber, just get it tuned properly.

[Falken_KE30]

what fuel you running? you should be running a minium of 95 octane

timing? should be between 8 and 15 degrees advanced

 

 

also check the fuel cut solenoid on the side of the carby, get someone to turn the ignition on while you listen to the carby, you should hear a click

 

I'm not really sure how they service the solenoid? remove clean and refit?

 

 

or if its a manual just put the handbrake on and drop the clutch in 4th :y:

 

Surely its only 6BTDC on a stock 4k.

 

oh, and drop clutch in 4th? awesome advice coming from someone who holds up cars with springs and batteries.....

and surely the solenoid on the stock carby is a idle one? disconnect the wire and the car stops ideling. unless it also stops "dieseling" then awesome :dance:

Edited January 18, 2010 by Falken_KE30

[rolla rookie =D]

cheers for all the posts guys, been very helpfull.

 

i think it could be the motor being carboned up because its only just started doing it just recently so yeah, and no matter what timing i got it on it still does it.

 

another thing could be the carby, because ive never been able to get it to idle right and when the engines hot i put my foot into it and can smell fuel fumes a mile away (this is with the mixture screw at 1 and a quater turns)

 

cheers-jake

[rolla rookie =D]

Usual cause is timing too advanced, occasional cause is being too hot (are you sure your temp gauge is correct?) or a lean mixture, or low-octane fuel, or a carboned up motor.

 

The fuel shut-off solenoid is definately a likely factor I think, otherwise they wouldn't have bothered to fit one at the factory.

 

You can build a knock detector for a handful of bucks-

 

http://autospeed.com.au/cms/article.html?&A=0353

 

When can you smell fuel? When you're driving or when you turn the motor off and get out?

 

i can smell fuel when I'm driving and the cars had time to warm up

 

cheers