Dimsdale
10-06-2003, 09:32
(this is also posted in the Members forum)
For the past couple of mornings (about freezing temps) I have had some odd symptoms that I am hoping someone may have input on.
When the "wait to start" light goes out, I start the vehicle normally, and it catches almost immediately, but there is very little clatter and some significant white smoke. Then the clatter suddenly starts, and the smoke goes away.
When driving away after 5 minutes or so of warm up, the response to the accelerator pedal was not normal; it would go up to maybe 1500 rpm, but the rpms would drop, particularly if I applied more "gas." This stumbling action went on for about a mile, then cleared up and the truck ran normally for my 50 mile commute. The idle was normal, and I could hear the turbocharger whistling normally (I assume).
First thoughts are glow plugs followed by the controller or relay (this is a 99 L65 Suburban with the 4L80E), but that should not affect the running after some warmup. That leaves the electronic controls for the pump, which the lack of advance on startup would support. I am sure that I have to check, clean and grease up all the connections, which I have neglected since the pump was replaced (along with the engine and turbo and lift pump!) back in December-January. It almost seems like something is just wet, then dries out and functions normally. I would suspect the filter, but since it cleared after warming, it would have to be due to waxing, and I use additive all year round, and it really wasn't that cold. I will definitely check the pump too.
No SES, and all guages are reading normally. The only thing I didn't check this morning was the after glow cycle, which I will check this afternoon after work. Probably though, sitting in the sun all day, nice and warm, all will be just fine.
Any thoughts?
Thanks in advance.
For the past couple of mornings (about freezing temps) I have had some odd symptoms that I am hoping someone may have input on.
When the "wait to start" light goes out, I start the vehicle normally, and it catches almost immediately, but there is very little clatter and some significant white smoke. Then the clatter suddenly starts, and the smoke goes away.
When driving away after 5 minutes or so of warm up, the response to the accelerator pedal was not normal; it would go up to maybe 1500 rpm, but the rpms would drop, particularly if I applied more "gas." This stumbling action went on for about a mile, then cleared up and the truck ran normally for my 50 mile commute. The idle was normal, and I could hear the turbocharger whistling normally (I assume).
First thoughts are glow plugs followed by the controller or relay (this is a 99 L65 Suburban with the 4L80E), but that should not affect the running after some warmup. That leaves the electronic controls for the pump, which the lack of advance on startup would support. I am sure that I have to check, clean and grease up all the connections, which I have neglected since the pump was replaced (along with the engine and turbo and lift pump!) back in December-January. It almost seems like something is just wet, then dries out and functions normally. I would suspect the filter, but since it cleared after warming, it would have to be due to waxing, and I use additive all year round, and it really wasn't that cold. I will definitely check the pump too.
No SES, and all guages are reading normally. The only thing I didn't check this morning was the after glow cycle, which I will check this afternoon after work. Probably though, sitting in the sun all day, nice and warm, all will be just fine.
Any thoughts?
Thanks in advance.