Acceleration surge when cold only. - Land Rovers Only

LANDY96 · 01-03-2006, 12:19 PM

When I am starting out in the morning, and the engine is cold, I have some light surging. What is this all about. It almost feels like the clutch is slipping. I have bosch 4platinums in this. Could this be carbon build up from first start. As soon as the engine warms up in about 5 min of driving time. She smooths out all across the range.

I have about 20k miles on these plugs. I know most of you don't like these plugs, but learned this after I bought them. Anyway no real problems. Thanks!

Disco Mike · 01-03-2006, 03:46 PM

Don't knock the plugs, I run them and have lots of friends that use them with good results.
You could have a temp sensor failing, a fuel pressure problem or it could be ready for a good maintance service. How many miles on the truck? Have you changed out the plug wires, O2 sensors, cap and rotor, fuel filter???
Just some thoughts.
Mike J.

roverX · 01-03-2006, 06:17 PM

When was the last time you ran a good fuel injector cleaner?

Rovin4life · 01-03-2006, 06:57 PM

check the fuel pressure. if should read forty psi. turn it off and watch for it to stay the same. It shouldnt drop no more then maybe five in an old vehicle. if it drops fast then you have a problem. clamp off the return hose and check to see if it still drops. if it doesnt then its a regulator. if it does then its an injector or a pump. of course you need to test at the pump to verify that.

LANDY96 · 01-04-2006, 09:16 AM

Well, guys, fuel pressure is good, filters have been changed recently, the truck has a gems system(no cap and rotor). I probably need to change the wires. And run some fuel cleaner, (what a dumba$$, I should have done this

) Thanks!!

roverX · 01-04-2006, 10:38 AM

Try to get ahold of some B&G 44K fuel injector cleaner. If you can't locate some, PM DiscoMike and he can tell you where to get some.

Rovin4life · 01-04-2006, 09:52 PM

Do you have an intake leak.

Its possible that the intake are leaking and its causing a vacuum leak.

Heres an idea take a can of carbureator cleaner and spray the intake gaskets.

If there is a leak the surging will go away for a moment as the vacuum picks up the carbureator cleaner.

If you have a scanner you could check long and short fuel trims.

01-03-2006, 12:19 PM	#1 (permalink)
LANDY96 Senior Member Join Date: Jan 2005 Location: Beaumont, Texas Posts: 782 Gallery: 0	Acceleration surge when cold only. When I am starting out in the morning, and the engine is cold, I have some light surging. What is this all about. It almost feels like the clutch is slipping. I have bosch 4platinums in this. Could this be carbon build up from first start. As soon as the engine warms up in about 5 min of driving time. She smooths out all across the range. I have about 20k miles on these plugs. I know most of you don't like these plugs, but learned this after I bought them. Anyway no real problems. Thanks! __________________ Eric The Red 93 Range Rover Classic We will never "arrive" so the goal is to keep moving forward on our journey so we can periodically declare, "I am not what I want to be, but I am not what I used to be!" 96 DISCO SE7 5-SPEED SOLD ....okay couldn't live without a disco! 96 DISCO SD 5-SPEED -ARB Bumper -OME 2" Lift -2" spacers -Safari snorkel -15" steelies

01-03-2006, 06:17 PM	#3 (permalink)
roverX Elephantitis penisitis Join Date: Apr 2005 Posts: 5,439 Gallery: 0	When was the last time you ran a good fuel injector cleaner? __________________ What? Is this where I'm supposed to write some profound statement that boggles the intellect of the genius that you think you are? Why would I waste my time with that when I can be getting free lap dances from your sister AND your girlfriend at the same time?

01-04-2006, 09:16 AM	#5 (permalink)
LANDY96 Senior Member Join Date: Jan 2005 Location: Beaumont, Texas Posts: 782 Gallery: 0	Well, guys, fuel pressure is good, filters have been changed recently, the truck has a gems system(no cap and rotor). I probably need to change the wires. And run some fuel cleaner, (what a dumba$$, I should have done this ) Thanks!! __________________ Eric The Red 93 Range Rover Classic We will never "arrive" so the goal is to keep moving forward on our journey so we can periodically declare, "I am not what I want to be, but I am not what I used to be!" 96 DISCO SE7 5-SPEED SOLD ....okay couldn't live without a disco! 96 DISCO SD 5-SPEED -ARB Bumper -OME 2" Lift -2" spacers -Safari snorkel -15" steelies

01-04-2006, 10:38 AM	#6 (permalink)
roverX Elephantitis penisitis Join Date: Apr 2005 Posts: 5,439 Gallery: 0	Try to get ahold of some B&G 44K fuel injector cleaner. If you can't locate some, PM DiscoMike and he can tell you where to get some. __________________ What? Is this where I'm supposed to write some profound statement that boggles the intellect of the genius that you think you are? Why would I waste my time with that when I can be getting free lap dances from your sister AND your girlfriend at the same time?

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01-03-2006, 03:46 PM	#2 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,777 Gallery: 0	Don't knock the plugs, I run them and have lots of friends that use them with good results. You could have a temp sensor failing, a fuel pressure problem or it could be ready for a good maintance service. How many miles on the truck? Have you changed out the plug wires, O2 sensors, cap and rotor, fuel filter??? Just some thoughts. Mike J.

01-03-2006, 06:57 PM	#4 (permalink)
Rovin4life Former NAS LR TECH, Current AUS LR TECH Join Date: Oct 2005 Location: DOWN UNDER Posts: 1,884 Gallery: 0	check the fuel pressure. if should read forty psi. turn it off and watch for it to stay the same. It shouldnt drop no more then maybe five in an old vehicle. if it drops fast then you have a problem. clamp off the return hose and check to see if it still drops. if it doesnt then its a regulator. if it does then its an injector or a pump. of course you need to test at the pump to verify that.

01-04-2006, 09:52 PM	#7 (permalink)
Rovin4life Former NAS LR TECH, Current AUS LR TECH Join Date: Oct 2005 Location: DOWN UNDER Posts: 1,884 Gallery: 0	Do you have an intake leak. Its possible that the intake are leaking and its causing a vacuum leak. Heres an idea take a can of carbureator cleaner and spray the intake gaskets. If there is a leak the surging will go away for a moment as the vacuum picks up the carbureator cleaner. If you have a scanner you could check long and short fuel trims.

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