3 cylinders wet ruff idle, your thoughts
10-20-2017, 06:45 AM
#1
MBWorld Fanatic!
Thread Starter
3 cylinders wet ruff idle, your thoughts
Had my old beast stationary for a while, still was driving fine, took it into service and when they started her up it had a very ruff idle.
after further inspections they assumed coils were at fault and changed a few, got better but still ruff.
inspected cylinders and found 3 were wet (assuming fueling) they are checking out the injectors to see if they are spraying right
only thing that comes to mind is I have the TTM looped fuel rail. Do those run stock injectors or not? I recall they sprayed different, and yes I was tuned for them
car has been tuned for years, never ran into this issue
Thoughts? was debating going back to stock rail, as I never really saw the benefit in the looped rail. I do not run monster size crank pullies as I do not want the heat.
after further inspections they assumed coils were at fault and changed a few, got better but still ruff.
inspected cylinders and found 3 were wet (assuming fueling) they are checking out the injectors to see if they are spraying right
only thing that comes to mind is I have the TTM looped fuel rail. Do those run stock injectors or not? I recall they sprayed different, and yes I was tuned for them
car has been tuned for years, never ran into this issue
Thoughts? was debating going back to stock rail, as I never really saw the benefit in the looped rail. I do not run monster size crank pullies as I do not want the heat.
10-20-2017, 08:37 AM
#3
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Join Date: Apr 2017
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05 E55, 98 CLK320
I would go back to your stock rail if you have doubts, I cannot tell why it would be running rough... maybe you have bigger injectors that you're not tuned for?
10-20-2017, 02:36 PM
#4
Senior Member
check plugs and wires.
I had a bad wire on another car that was sparking but sparking weak so the firing was intermittent. SUPER frustrating.
I changed out the full wire set and problem instantly vanished. Then I went back and tested the wires 1 by 1. (4-banger so an easy job)
I had a bad wire on another car that was sparking but sparking weak so the firing was intermittent. SUPER frustrating.
I changed out the full wire set and problem instantly vanished. Then I went back and tested the wires 1 by 1. (4-banger so an easy job)
10-20-2017, 11:04 PM
#5
MBWorld Fanatic!
You would waist your time taking the rail out.
It has no effect on spray pattern and you will not "see" anything different with a looped rail...only on a test jig to watch it "fuel performance and pressure". I have seen this on an injector test machine.
Look at the plugs and wires first like Fonktron stated.
Even bigger injectors will run some what because the O-2 sensors will keep it "the AFR" where it needs to be...until boosted... but your problem is not under boost.
Something happened, part failure while it was parked.
It has no effect on spray pattern and you will not "see" anything different with a looped rail...only on a test jig to watch it "fuel performance and pressure". I have seen this on an injector test machine.
Look at the plugs and wires first like Fonktron stated.
Even bigger injectors will run some what because the O-2 sensors will keep it "the AFR" where it needs to be...until boosted... but your problem is not under boost.
Something happened, part failure while it was parked.
Last edited by SICAMG; 10-20-2017 at 11:10 PM.
10-26-2017, 11:07 PM
#7
Super Member
happened on both my sl55 and e55. injector got stuck open pouring fuel in so much that it filled up one hole and spilled over to other cylinders
