Hard start! - Land Rovers Only

Lucasfree · 03-09-2005, 10:45 AM

My 90 range when cold is very hard starting after about 5 minutes of cranking it will start. when warm it will start fine though i but has a bad hesitation when running, the idle is a little erratic too. i replaced the fuel filter and tried to replace the pump with a borg warner p39 pump but that didnt work! i put a "standard" brand coil in it could this be the problem? iam banging my head against the wall on this now i does smell like it is running very rich maybe fuel pressure regulator? it has to be a fuel issue what do you think?

OkieRover · 03-09-2005, 10:59 AM

I suspect the coil.
Is the spark a nice healthy one?
How far will it arc?
When my coil failed due to my ignition module my spark was very weak.
Have you moved your ignition module yet?

Disco · 03-09-2005, 01:01 PM

The symptoms you describe sound like the Idle control valve (Stepper motor)has got gummed up a little. You can clean this with carb cleaner or similar solvent.

OkieRover · 03-09-2005, 01:49 PM

Upon re-reading your post.
Disco has a good point.

Kevin88RRC · 03-09-2005, 09:22 PM

Also check your temp sensor (the one for the EFI not to the guage). If it is on it's way out, it will be telling the ECU false readings resulting in a wrong mixture to start. Here http://www.rangie.com/articles_topic...at=7&subCat=51 this explains it better than I can.

Lucasfree · 03-10-2005, 07:27 AM

Ok i checked the idle air control valve by swapping them with the one from my 1990 gmc truck both worked fine in either truck. so i have narrowed it down to the fuel temp sender. can i take it out and swap it with the manifold temp sender? they do look identicle just for test sake?

CoachDitka · 03-10-2005, 08:46 AM

Quote:

Originally Posted by Lucasfree

Ok i checked the idle air control valve by swapping them with the one from my 1990 gmc truck both worked fine in either truck. so i have narrowed it down to the fuel temp sender. can i take it out and swap it with the manifold temp sender? they do look identicle just for test sake?

Just out of curiosity, what exact model/year/engine is your GMC truck? I have been looking for a cheap replacement IAC valve that someone has actually cross-tested.

Thanks!

-Coach

Lucasfree · 03-10-2005, 05:24 PM

it is a 1990 gmc sierra with a 305 tbi engine

03-09-2005, 10:45 AM	#1 (permalink)
Lucasfree Member Join Date: Jan 2005 Posts: 27 Gallery: 0	Hard start! My 90 range when cold is very hard starting after about 5 minutes of cranking it will start. when warm it will start fine though i but has a bad hesitation when running, the idle is a little erratic too. i replaced the fuel filter and tried to replace the pump with a borg warner p39 pump but that didnt work! i put a "standard" brand coil in it could this be the problem? iam banging my head against the wall on this now i does smell like it is running very rich maybe fuel pressure regulator? it has to be a fuel issue what do you think?

03-09-2005, 01:01 PM	#3 (permalink)
Disco Super Moderator Join Date: Dec 2004 Posts: 1,819 Gallery: 0	The symptoms you describe sound like the Idle control valve (Stepper motor)has got gummed up a little. You can clean this with carb cleaner or similar solvent. __________________ No hand signals, driver playing with his transfer Knob.

03-09-2005, 09:22 PM	#5 (permalink)
Kevin88RRC Senior Member Join Date: Sep 2004 Location: Portland, Maine Posts: 706 Gallery: 0	Also check your temp sensor (the one for the EFI not to the guage). If it is on it's way out, it will be telling the ECU false readings resulting in a wrong mixture to start. Here http://www.rangie.com/articles_topic...at=7&subCat=51 this explains it better than I can. __________________ Kevin 88 RRC "Audrey"

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03-10-2005, 07:27 AM	#6 (permalink)
Lucasfree Member Join Date: Jan 2005 Posts: 27 Gallery: 0	Ok i checked the idle air control valve by swapping them with the one from my 1990 gmc truck both worked fine in either truck. so i have narrowed it down to the fuel temp sender. can i take it out and swap it with the manifold temp sender? they do look identicle just for test sake?

03-10-2005, 05:24 PM	#8 (permalink)
Lucasfree Member Join Date: Jan 2005 Posts: 27 Gallery: 0	it is a 1990 gmc sierra with a 305 tbi engine

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