trying to diesel

88Supraboy · 11-01-2005, 12:14 AM

when i turn my 88 n/a off it will keep running for a few seconds then shut off, even with the ignition off and key out. I know overheating can cause this but its not hot at all, it will even do it when dead cold. Ive also re-checked my timming and its still around 12 degrees advanced. just wondering if anybody has experienced this or know what to fix.

Thanks Supra Lovers!!

Bullz_EyE · 11-01-2005, 02:32 AM

That's weird. I thought dieseling was only subject to carbureted vehicles because fuel gets shut-off when the ignition is off. You may want to try a bottle or two of strong fuel system cleansers and see if problem persists.

SupraMan1784 · 11-01-2005, 01:49 PM

where are your rpms at idle? and do you hear any other noises?

rnoswal · 11-01-2005, 02:06 PM

Sounds like a leak in the injector, or one that is not spraying right. Also there could be a lot of carbon buildup on the piston top. The combination of fuel not being burned completely and soaking the carbon on the piston could keep it running a little bit longer. The carbon stays hot and ignites the fuel even without a spark.

They make cleaners for that purpose at the parts houses, but sometimes the carbon is very hard and takes a wire brush. Just my guess though.

Russ

supra_91 · 11-01-2005, 02:44 PM

get some seafoam. you can find it at any auto parts place or even walmart for that matter

this stuff works really good

Burn N' Up · 11-01-2005, 09:19 PM

Even though it probably won't help your specific problem every car can use a good seafoaming once in awhile. seafoam is good stuff. Maybe your fuel shut off? or your fuel pressure reliefe valve? if its not dumping fuel will continue to spray for a few moments into the engine, that is all assumeing that it is hot enough to combust though....

11-01-2005, 12:14 AM	#1
88Supraboy 3" Exhaust Join Date: Oct 2005 Location: Michigan Posts: 55	trying to diesel when i turn my 88 n/a off it will keep running for a few seconds then shut off, even with the ignition off and key out. I know overheating can cause this but its not hot at all, it will even do it when dead cold. Ive also re-checked my timming and its still around 12 degrees advanced. just wondering if anybody has experienced this or know what to fix. Thanks Supra Lovers!!

11-01-2005, 01:49 PM	#3
SupraMan1784 SP58GT Join Date: Jun 2005 Location: Dirty Jerz Posts: 691	where are your rpms at idle? and do you hear any other noises? __________________ Now: Saving for an MKIV Broken Rides: (Sold) 91 supra turbo 5speed with a 1jzgte motor 421whp 400(399) ft*lbs of torque on tap @ 15 psi "Always outnumbered, never outgunned."

11-01-2005, 02:44 PM	#5
supra_91 Lexus & 550's Join Date: Sep 2005 Location: Illinois Posts: 521	get some seafoam. you can find it at any auto parts place or even walmart for that matter this stuff works really good __________________ 91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims

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11-01-2005, 02:32 AM	#2
Bullz_EyE 3" Exhaust Join Date: Oct 2005 Location: San Diego, CA Posts: 238	That's weird. I thought dieseling was only subject to carbureted vehicles because fuel gets shut-off when the ignition is off. You may want to try a bottle or two of strong fuel system cleansers and see if problem persists.

11-01-2005, 02:06 PM	#4
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	Sounds like a leak in the injector, or one that is not spraying right. Also there could be a lot of carbon buildup on the piston top. The combination of fuel not being burned completely and soaking the carbon on the piston could keep it running a little bit longer. The carbon stays hot and ignites the fuel even without a spark. They make cleaners for that purpose at the parts houses, but sometimes the carbon is very hard and takes a wire brush. Just my guess though. Russ

11-01-2005, 09:19 PM	#6
Burn N' Up 3" Exhaust Join Date: Sep 2005 Posts: 238	Even though it probably won't help your specific problem every car can use a good seafoaming once in awhile. seafoam is good stuff. Maybe your fuel shut off? or your fuel pressure reliefe valve? if its not dumping fuel will continue to spray for a few moments into the engine, that is all assumeing that it is hot enough to combust though....