Stuttering On First Start Up

[Street Wolf]

Just recently my 00' Disco has developed a bit of a stuttering problem on first start up for a second or two right after it's cranked over. Doesn't seem to matter if it's cold, or warm outside, it doesn't run poorly afterwords, and only does it after it has set a while (First start of the day).

What could be causing this issue?

 

[rovertech]

Just recently my 00' Disco has developed a bit of a stuttering problem on first start up for a second or two right after it's cranked over. Doesn't seem to matter if it's cold, or warm outside, it doesn't run poorly afterwords, and only does it after it has set a while (First start of the day).

What could be causing this issue?

Does it smoke at all once it fires up? I would suspect that the fuel rail is bleeding down after sitting for an extended period. Either through leaky injector/s or possibly back through the fuel line through the pump check valve and into the tank. If it smokes at all when it starts and runs rough I would have the injectors checked for leakage. D2 injectors are nowhere near as problematic compared to GEMS or CUX style lucas injectors but I have replaced a set for this problem.

 

[Street Wolf]

Does it smoke at all once it fires up? I would suspect that the fuel rail is bleeding down after sitting for an extended period. Either through leaky injector/s or possibly back through the fuel line through the pump check valve and into the tank. If it smokes at all when it starts and runs rough I would have the injectors checked for leakage. D2 injectors are nowhere near as problematic compared to GEMS or CUX style lucas injectors but I have replaced a set for this problem.

Nothing excessive, but now that you've mentioned it I'll sit and watch the exhaust more closely on first start up tomorrow and see for sure. It's kind of a pain trying to diagnose this problem since I have to let it sit nearly a full day it seems before the problem will occur again.

 

[Mike_rupp]

It could also be a weak fuel pump. The next time you are going to start the truck after it sits a while, turn the key but don't turn the starter over. The fuel pump will pressurize for a second or two and then shut off. Then turn the key back to off. Again, turn the key back to the on position and let the fuel pump go through another cycle and then start the truck. If the problem goes away, the fuel pump is likely weak.

You might want to check the pressure to see what kind of pressure you are getting. Keep in mind to check the pressure with the ignition on / engine off.

 

[Street Wolf]

It could also be a weak fuel pump. The next time you are going to start the truck after it sits a while, turn the key but don't turn the starter over. The fuel pump will pressurize for a second or two and then shut off. Then turn the key back to off. Again, turn the key back to the on position and let the fuel pump go through another cycle and then start the truck. If the problem goes away, the fuel pump is likely weak.

You might want to check the pressure to see what kind of pressure you are getting. Keep in mind to check the pressure with the ignition on / engine off.

Will do! I should have thought of that myself, thanks for bringing that idea up. We'll see what happens. :sombrero:

 

[rovertech]

It could also be a weak fuel pump. The next time you are going to start the truck after it sits a while, turn the key but don't turn the starter over. The fuel pump will pressurize for a second or two and then shut off. Then turn the key back to off. Again, turn the key back to the on position and let the fuel pump go through another cycle and then start the truck. If the problem goes away, the fuel pump is likely weak.

You might want to check the pressure to see what kind of pressure you are getting. Keep in mind to check the pressure with the ignition on / engine off.

Mike,

Unlike D1/RRC, D2's won't activate the pump until you go to crank over. I don't know why they made the change.

 

[Mike_rupp]

Ok, scrap what I said.

It still makes sense to check the fuel pressure at ignition on / engine off. A weak pump will have a hard time getting to the maximum fuel pressure.

 

[Street Wolf]

Mike,

Unlike D1/RRC, D2's won't activate the pump until you go to crank over. I don't know why they made the change.

Ok, scrap what I said.

It still makes sense to check the fuel pressure at ignition on / engine off. A weak pump will have a hard time getting to the maximum fuel pressure.

Wonder who's decision it was to change that? Odd.

Anyways, what should the proper PSI be anyways?

 

[mongosd2]

Wonder who's decision it was to change that? Odd.

Anyways, what should the proper PSI be anyways?

on a d2 it's about 50psi...

 

[Street Wolf]

Alright, just thought I might add...

Here's what I got for SES codes

P1590
P1170
P1171



Can anyone tell me for sure what they are?

 

[mongosd2]

p1590 is a rough road code, check your abs sensors
p1170 o2 sensor code...left hand side
p1171 injector code, can't remember which one...

I hope that helps

 

[Street Wolf]

p1590 is a rough road code, check your abs sensors
p1170 o2 sensor code...left hand side
p1171 injector code, can't remember which one...

I hope that helps

Thanks a bunch. :sombrero:

 

[rugbier]

P1590 = ABS Failure ( now if you meant 1509 = Idle Control )
P1170 = Too lean O2 Sensor
P1171 = Too Rich 02 Sensor


looks to me something got wet on your truck as I never heard of 71 and 72 combo.

But then again.. what do I know

Alright, just thought I might add...

Here's what I got for SES codes

P1590
P1170
P1171



Can anyone tell me for sure what they are?

 

[Street Wolf]

P1590 = ABS Failure ( now if you meant 1509 = Idle Control )
P1170 = Too lean O2 Sensor
P1171 = Too Rich 02 Sensor


looks to me something got wet on your truck as I never heard of 71 and 72 combo.

But then again.. what do I know

Truck hasn't been near water for a while now, and the codes seem to pop up at random driving down the road. SES will stay off for a while after they're deleted before it comes back for no apparent reason.

 

[timmy!!!!!!!]

Corrosion on the ECU?