Hard to start

lmmr74 · 01-03-2012, 04:08 PM

So i did had a BHG. It was fixed, the engine head was machined, news bolts, new gasket etc...I told the mechanic to torque the bolts at 75 lb instead of the 58 mentioned by Toyota. After a road test the car woks fine, no overheating, no loss of water. However i still have the heat soak synptoms that i was experiencing before fixing the BHG, everytime i drive the car and shutt it off, after 30 min if i try to start it again, it's hard to get it started. I had this problem before i fix the BHG...Is this heat Soak? Can this be a problem with the fuel injection system/fuel pump?
Any help will be appreciated!

Regards

CanadianBak'inSupra · 01-04-2012, 03:56 AM

IF the HG was taken care of properly i would assume, gauge or radiator failure. possibly a member with more knowledge on overheating problems could offer help???
hint hint, nudge nudge, bump bump...

cre · 01-04-2012, 04:43 AM

Bah, hint taken...

No error codes stored in the ECU?

Definitely sounds like heat soak, but not in the traditional sense. It sounds like you have a component which is failing as the engine bay warms up. The first thing to do is to test the coils, fuel pump resister and relay, injector resistor pack and AFM RIGHT AWAY once the engine dies or starts messing up... You won't have a lot of time to work on it so try to be quick, but thorough. Once you reduce the number of possibilities you can use a strong hair dryer or heat gun to bring the parts up to temp to continue testing until one fails. The last time I had this happen the AFM was the problem (no error codes were stored though).

lmmr74 · 01-04-2012, 10:02 AM

I forgot to mention that the car runs great, the only thing is that after shut the engine off it's hard to get it started...but when it starts it runs smoothly.
Is heat soak inevitable?? I never heard about this problem before, in other cars/brands...what to do in order to prevent it?

Thanks for the help!

cre · 01-04-2012, 05:19 PM

I just told you what it sounds like and what to check first. I have seen this before on vehicles I've worked on; While it isn't common it's not rare either.

01-03-2012, 04:08 PM	#1
lmmr74 Stock Join Date: Aug 2011 Location: Portugal Posts: 21	Hard to start So i did had a BHG. It was fixed, the engine head was machined, news bolts, new gasket etc...I told the mechanic to torque the bolts at 75 lb instead of the 58 mentioned by Toyota. After a road test the car woks fine, no overheating, no loss of water. However i still have the heat soak synptoms that i was experiencing before fixing the BHG, everytime i drive the car and shutt it off, after 30 min if i try to start it again, it's hard to get it started. I had this problem before i fix the BHG...Is this heat Soak? Can this be a problem with the fuel injection system/fuel pump? Any help will be appreciated! Regards

01-04-2012, 03:56 AM	#2
CanadianBak'inSupra Official hall monitor / search nazi - NO SOUP FOR YOU! Join Date: Oct 2009 Location: Canada, BC Posts: 837	IF the HG was taken care of properly i would assume, gauge or radiator failure. possibly a member with more knowledge on overheating problems could offer help??? hint hint, nudge nudge, bump bump... __________________ 1984 supra - 1uzfe - w58 - 4.10 - 1 piece aluminum shaft.

01-04-2012, 04:43 AM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Bah, hint taken... No error codes stored in the ECU? Definitely sounds like heat soak, but not in the traditional sense. It sounds like you have a component which is failing as the engine bay warms up. The first thing to do is to test the coils, fuel pump resister and relay, injector resistor pack and AFM RIGHT AWAY once the engine dies or starts messing up... You won't have a lot of time to work on it so try to be quick, but thorough. Once you reduce the number of possibilities you can use a strong hair dryer or heat gun to bring the parts up to temp to continue testing until one fails. The last time I had this happen the AFM was the problem (no error codes were stored though). __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

01-04-2012, 05:19 PM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I just told you what it sounds like and what to check first. I have seen this before on vehicles I've worked on; While it isn't common it's not rare either. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Hard Start When Cold And Warm	jkbwd2	MKIII Supra	0	07-03-2011 07:39 PM
Cold Start System Testing (hard starting)	mrnickleye	MKIII Supra	12	11-13-2010 08:32 PM
NEED HELP!!! Car is hard to start and will not maintain idle.	Slinks2000	MKIII Supra	0	05-06-2010 08:00 AM
MARK3 ,sometimes hard to start, idle rpm not stable.	chinesedawn	MKIII Supra	15	02-16-2010 02:15 AM
89Supra hard start	atsomepoint	Non-Generation Specific Questions	6	07-21-2007 08:05 PM

01-04-2012, 10:02 AM	#4
lmmr74 Stock Join Date: Aug 2011 Location: Portugal Posts: 21	I forgot to mention that the car runs great, the only thing is that after shut the engine off it's hard to get it started...but when it starts it runs smoothly. Is heat soak inevitable?? I never heard about this problem before, in other cars/brands...what to do in order to prevent it? Thanks for the help!