Intermittent starting problem - revisited... - Land Rovers Only

9dawgs · 09-23-2006, 12:05 PM

Ok guys, I've replaced the fuel filter, with negres. I just replaced the multi-unit fuel pump relay. Still no joy... It seems like it just doesn't get fuel for a few starting attempts then all of a sudden it starts right up like nothing happened. I'd like to exhaust all "simple" possibilities before I replace the fuel pump. Anyone have any other thoughts on this?

This I know:
The fuel pressure is not bleeding off because the longer the vehicle sits the better chances of it starting right up. (ie; I take it to work and it starts everytime I get in to go home after sitting for 8hrs) If I stop to get gas on the way to work, then it won't start on first attempt when I try to leave the gas station. It takes about 3 tries to get it started.

If I feather the gas pedal I can start it on the first attempt but when I let my foot off the pedal it just dies. I can drive it this way but I have to keep the RPMs up to keep it from stalling.

It has to be some electrical component that fails intermittanly when it gets hot. Any help from a certified Rover mech would be greatly appreciated.

Georgecore · 09-24-2006, 01:23 PM

have you checked the main and/or fuel pump relays? I remember owning a honda that had the same symptoms your describing and it ended up being a relay.

me.guevara · 09-25-2006, 06:25 AM

Quote:

Originally Posted by 9dawgs

If I feather the gas pedal I can start it on the first attempt but when I let my foot off the pedal it just dies. I can drive it this way but I have to keep the RPMs up to keep it from stalling.

No certification here (not even any formal training in wrench-turning), so take it fwiw: the feathering that you have to do to the gas pedal sounds like a similar issue I had with the stepper motor (idle air control valve - iacv) on the side of the plenum chamber. When it goes, you'll have a bunch of stalling issues - I've become really good at keeping the engine running with my toes and braking with my heel, simultaneously.

Clean your iacv and make sure it has a good seal to the plenum. If you have access to another Disco, swap the actuators to see which vehicle keeps the problem. Looking at your sig, I notice you have a Chevy Astro - I'm pretty sure that the iacv on the Astro is interchangeable with that of the Disco (at least for a '95 Disco it is, but I'm not sure about what model year Astro - see http://www.rangerovers.net/discoparts/).

Good luck!

Are you running rich, too? That's another symptom.

mark555 · 11-07-2006, 05:53 PM

my name is mark and i have a 99 that randomly stalls and starts but no fire when hot . the intermittent part i have come to believe is a sensor ie: coolant sending unit,fuel temp sensor , or crank sensor my understanding is when one of these gets old and hot they cause no start symptoms

Disco · 11-07-2006, 07:53 PM

I'd suspect the Coolant Temperature Sensor.

AndeanDiscovery97 · 11-15-2006, 04:32 PM

I'm no certified Rover Tech, but had same issue. Changed potentiometer-butterfly and problem was solved.

09-23-2006, 12:05 PM	#1 (permalink)
9dawgs JesusIsLord Join Date: Jun 2005 Location: Tampa, FL Posts: 173 Gallery: 2	Intermittent starting problem - revisited... Ok guys, I've replaced the fuel filter, with negres. I just replaced the multi-unit fuel pump relay. Still no joy... It seems like it just doesn't get fuel for a few starting attempts then all of a sudden it starts right up like nothing happened. I'd like to exhaust all "simple" possibilities before I replace the fuel pump. Anyone have any other thoughts on this? This I know: The fuel pressure is not bleeding off because the longer the vehicle sits the better chances of it starting right up. (ie; I take it to work and it starts everytime I get in to go home after sitting for 8hrs) If I stop to get gas on the way to work, then it won't start on first attempt when I try to leave the gas station. It takes about 3 tries to get it started. If I feather the gas pedal I can start it on the first attempt but when I let my foot off the pedal it just dies. I can drive it this way but I have to keep the RPMs up to keep it from stalling. It has to be some electrical component that fails intermittanly when it gets hot. Any help from a certified Rover mech would be greatly appreciated. __________________ 9dawgs '99 Discovery I '99 Chevy Astro 4X2 w/4" Lift (family truckster) 17' Basstracker w/40HP Mercury 11' Jon Boat w/numerous antique outboards

11-07-2006, 07:53 PM	#5 (permalink)
Disco Super Moderator Join Date: Dec 2004 Posts: 1,819 Gallery: 0	I'd suspect the Coolant Temperature Sensor. __________________ No hand signals, driver playing with his transfer Knob.

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09-24-2006, 01:23 PM	#2 (permalink)
Georgecore Member Join Date: Aug 2006 Location: Milwaukee, WI Posts: 25 Gallery: 0	have you checked the main and/or fuel pump relays? I remember owning a honda that had the same symptoms your describing and it ended up being a relay.

11-07-2006, 05:53 PM	#4 (permalink)
mark555 Member Join Date: Nov 2006 Posts: 3 Gallery: 0	my name is mark and i have a 99 that randomly stalls and starts but no fire when hot . the intermittent part i have come to believe is a sensor ie: coolant sending unit,fuel temp sensor , or crank sensor my understanding is when one of these gets old and hot they cause no start symptoms

11-15-2006, 04:32 PM	#6 (permalink)
AndeanDiscovery97 wrench-turner Join Date: Apr 2006 Location: Colombia - Bogota Posts: 1 Gallery: 0	I'm no certified Rover Tech, but had same issue. Changed potentiometer-butterfly and problem was solved.

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