coon smile
New member
- Joined
- Oct 25, 2007
- Messages
- 3,399
I've got an 06 CR truck that has cold starting issues. I have started it in weather anywhere between low 40's and mid 20's all with the same result. It has a grid heater delete, and the block heater is unplugged. It makes about 5-8 revolutions before it starts when cold. When warm it cranks 3 times pretty consistently and fires.
After the engine sits several hours and you fire it up, it will chug, idle rough and blow a good amount of white smoke. If you bring the engine up to about 1500 rpm, it will stumble and run a little rough for about 10 seconds. After that, the idle smooths out a little and smoke clears up.
I figured the injectors were wore out, and I swapped in a brand new set of Exergy 100% sac injectors. Calibration sheet showed that all were within 1.8%, which seemed a little higher that what I've seen from other sets.
The truck still has the same issues as described above. The only difference I noticed with the new injectors was that the low boost rattle got a lot louder with the Exergys, spool was a tad quicker, maybe a bit cleaner under boost, but there's a slight black haze at idle. It's got an EFI tune it from the previous owner, but it did not have the black idle haze with the 235 HP injectors that were in it before the swap.
I found a shop that has a Snap On Solus Ultra scan tool, and when we hooked it up to the truck, we ran the cylinder/injector contribution test and found that all were around 100% except for #6 which was at 89%.
So I swapped #5 and #6 injectors to rule out the possibility of a compression issue. After the swap, #1,3,4,6 were +/- 100% and #5 and #2 were 89%. So the 89% figure followed #6 injector, but I'm not sure why #2 now shows 89%. I have no idea what the scan tool uses to calculate that %, but now I'm not sure what I learned from this test, except that the low value followed one of the injectors and randomly popped up in another.
Couple other notes while using scan tool:
Scan tool reads 9000 psi rail pressure at ide, which I was told was high. I don't have a gauge in the cab. Maybe a rp sensor, dual cp3 controller or fca(s)?
With no load on it and rev'ed to 2500 rpm or so the scan tool would read 17-18,000 psi.
I've got the following codes - P0341, P0606, P0602
The tach on the dash shows around 500 rpm and the scan tool shows around 750 rpm at idle at the same time. Sometimes the tach on the dash reads between 650-750, and then it will randomly drop straight to 500. When it drops, you can't hear or feel a change in idle.
I put a new battery in it today, and it still cranks pretty slow and didn't change anything.
Any ideas?
After the engine sits several hours and you fire it up, it will chug, idle rough and blow a good amount of white smoke. If you bring the engine up to about 1500 rpm, it will stumble and run a little rough for about 10 seconds. After that, the idle smooths out a little and smoke clears up.
I figured the injectors were wore out, and I swapped in a brand new set of Exergy 100% sac injectors. Calibration sheet showed that all were within 1.8%, which seemed a little higher that what I've seen from other sets.
The truck still has the same issues as described above. The only difference I noticed with the new injectors was that the low boost rattle got a lot louder with the Exergys, spool was a tad quicker, maybe a bit cleaner under boost, but there's a slight black haze at idle. It's got an EFI tune it from the previous owner, but it did not have the black idle haze with the 235 HP injectors that were in it before the swap.
I found a shop that has a Snap On Solus Ultra scan tool, and when we hooked it up to the truck, we ran the cylinder/injector contribution test and found that all were around 100% except for #6 which was at 89%.
So I swapped #5 and #6 injectors to rule out the possibility of a compression issue. After the swap, #1,3,4,6 were +/- 100% and #5 and #2 were 89%. So the 89% figure followed #6 injector, but I'm not sure why #2 now shows 89%. I have no idea what the scan tool uses to calculate that %, but now I'm not sure what I learned from this test, except that the low value followed one of the injectors and randomly popped up in another.
Couple other notes while using scan tool:
Scan tool reads 9000 psi rail pressure at ide, which I was told was high. I don't have a gauge in the cab. Maybe a rp sensor, dual cp3 controller or fca(s)?
With no load on it and rev'ed to 2500 rpm or so the scan tool would read 17-18,000 psi.
I've got the following codes - P0341, P0606, P0602
The tach on the dash shows around 500 rpm and the scan tool shows around 750 rpm at idle at the same time. Sometimes the tach on the dash reads between 650-750, and then it will randomly drop straight to 500. When it drops, you can't hear or feel a change in idle.
I put a new battery in it today, and it still cranks pretty slow and didn't change anything.
Any ideas?
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