High Idle - Suggestions required
#1
High Idle - Suggestions required
Finally got my built block into the car. Car seems to drive fine (still under 0 vac) but have a slight issue with idle. Car has been turbo'd on the stock block for quite sometime running the haltech but after the engine build I have this high idle issue.
Sequence of events:
1. Cold start high idle due to cold start
2. When warm car idles at ~850 rpm as per normal (solid idle)
3. Let it idle for little longer it will start idling at 1000 rpm (solid idle)
4. Drive car, stop at lights, idle 1000 rpm, no stalling etc take off fine
5. Turn off car, start car idle at 850 rpm then in about 30secs idle to 1000 rpm
Diags performed
1. Uplug ecu over night for ICV relearn
2. Look for vac leak with butane gas, no idle change
3. Only code is P0011 but i think this is normal due to the haltech controlling the cams
4. All harneses where seated before battery installed and first crank
5. OEM Coolant temp sensor appears to be operational
Without getting into the full list:
Comp 8.8
JWT C2
Nismo twin plate
Haltech ECU with pass through on idle cells
I'm a bit at a loss on what to try next. I can try a smoke leak test but I thought if i had a leak the idle would fluctuate and not be consistent.
Any ideas would be awesome
Sequence of events:
1. Cold start high idle due to cold start
2. When warm car idles at ~850 rpm as per normal (solid idle)
3. Let it idle for little longer it will start idling at 1000 rpm (solid idle)
4. Drive car, stop at lights, idle 1000 rpm, no stalling etc take off fine
5. Turn off car, start car idle at 850 rpm then in about 30secs idle to 1000 rpm
Diags performed
1. Uplug ecu over night for ICV relearn
2. Look for vac leak with butane gas, no idle change
3. Only code is P0011 but i think this is normal due to the haltech controlling the cams
4. All harneses where seated before battery installed and first crank
5. OEM Coolant temp sensor appears to be operational
Without getting into the full list:
Comp 8.8
JWT C2
Nismo twin plate
Haltech ECU with pass through on idle cells
I'm a bit at a loss on what to try next. I can try a smoke leak test but I thought if i had a leak the idle would fluctuate and not be consistent.
Any ideas would be awesome
Last edited by MR RIZK; 05-23-2011 at 09:32 PM.
#2
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Kinda having an issue as well on the vq30 but I retorqued intake plenum, checked catch can and pcv valve. I found a leak on one of my catch can hoses. I noticed different catch can setups and pcv valve setups here, just throwing out possibilities of other places to check.
#3
I will check as I do have the arc catch can but I believe the hoses are ok as replace with new lines and clamps. However the PCV valve is different. I'm using the PCV that came with the donor motor as my orginal spark plug stem seals were leaking on one of the cylinders
Last edited by MR RIZK; 05-15-2011 at 09:57 PM.
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just to be sure, you are aware that the pcv is a threaded piece on the valve cover, right? which means that since you swapped your covers due to leaky spark plug tube seal, you can just unscrew the pcv from your previous one and swap it with whats on there. that'll help you narrow that one down real quick.
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#9
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ya, if you haven't flashed it for higher idle then i would put money on a vac leak somewhere causing unmetered air in. PCV would be my first place to look which you are doing.
also, i've never had a single code on my haltech so i don't know why you think a cam code is "normal" for a haltech unit. It shouldn't be normal. Maybe something is wrong with your cam sensors.
also, i've never had a single code on my haltech so i don't know why you think a cam code is "normal" for a haltech unit. It shouldn't be normal. Maybe something is wrong with your cam sensors.
#10
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I guess you still have the stock PVC venting (manifold pulling from PCV)? Otherwise, it doesnt matter, as we all use open breathers with no issue.
so even after driving for a while, the idle stays at 1000 rpms?
Also, leaving the battery off isnt really the TB reset, you have to turn the key on and off a few times.
so even after driving for a while, the idle stays at 1000 rpms?
Also, leaving the battery off isnt really the TB reset, you have to turn the key on and off a few times.
Last edited by str8dum1; 05-16-2011 at 11:00 AM.
#11
I did the TB reset last night according to the manual for
Accelerator Pedal Released Position Learning
Throttle Valve Closed Position Learning
Idle Air Volume Learning
which worked but did not resolve the issue. After the reset it sort of struggled to idle but then leveled out at 750rpm then 1 minute later it pulled up to 1000rpm.
I will hopefully replace the PCV tonight but I do not think this is the issue.
From here i will do the smoke test but like i said previously the idle is fine until the car gets to operating temp. Once at operating temp it always sits at 1000rpms even if I drive it.
I checked with the cipher and made sure that the base timing was at 15 deg and that the target idle was set to oem.
Binder:
Regarding the codes my investigation leads me to find that the P0011 and P0021 soft codes will be thrown when using the haltech if the haltechs cam timing is not within 5 degress of what the oem ecu should be doing.
Accelerator Pedal Released Position Learning
Throttle Valve Closed Position Learning
Idle Air Volume Learning
which worked but did not resolve the issue. After the reset it sort of struggled to idle but then leveled out at 750rpm then 1 minute later it pulled up to 1000rpm.
I will hopefully replace the PCV tonight but I do not think this is the issue.
From here i will do the smoke test but like i said previously the idle is fine until the car gets to operating temp. Once at operating temp it always sits at 1000rpms even if I drive it.
I checked with the cipher and made sure that the base timing was at 15 deg and that the target idle was set to oem.
Binder:
Regarding the codes my investigation leads me to find that the P0011 and P0021 soft codes will be thrown when using the haltech if the haltechs cam timing is not within 5 degress of what the oem ecu should be doing.
Last edited by MR RIZK; 05-17-2011 at 05:37 PM.
#12
Replaced the PCV with my original one no joy. Below is what happens on first start. Temp is in C
31 - 1200
35 - 1180
38 - 1150
40 - 1120
45 - 1080
49 - 1000
50 - 980
56 - 920
58 - 850
60 - 830
61 - 800
64 - 770
66 - 720
slight hunt
69 - 980 -1010
70 - 1000 rpm
31 - 1200
35 - 1180
38 - 1150
40 - 1120
45 - 1080
49 - 1000
50 - 980
56 - 920
58 - 850
60 - 830
61 - 800
64 - 770
66 - 720
slight hunt
69 - 980 -1010
70 - 1000 rpm
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so the stock ecu isn't flashed at all?
That is interesting about the haltech and codes. I've had hal tune it twice now so i guess my cam timing hasn't been messed with. I know for sure when i do slight tune changes i don't change the cam timing. I don't have much experience with it because the cams on the bikes i race and build is static and non-adjustable without switching to a new cam.
That is interesting about the haltech and codes. I've had hal tune it twice now so i guess my cam timing hasn't been messed with. I know for sure when i do slight tune changes i don't change the cam timing. I don't have much experience with it because the cams on the bikes i race and build is static and non-adjustable without switching to a new cam.
#17
Ok did the smoke test. One leak found on the catch can but no other. Tightened it up and no more leaks.
After the test did the learn procedure however still have the same issue. I replaced the TB with the one from the doner car and did the TB learn but still have issue.
I started the car with the intake pipe off as i don't need the MAF and can see that the butterfly looks to be in the closed position like when the car is off. What else controls the idle in these cars. is there tempreature controlled valve somewhere etc.
Running out of ideas
After the test did the learn procedure however still have the same issue. I replaced the TB with the one from the doner car and did the TB learn but still have issue.
I started the car with the intake pipe off as i don't need the MAF and can see that the butterfly looks to be in the closed position like when the car is off. What else controls the idle in these cars. is there tempreature controlled valve somewhere etc.
Running out of ideas
Last edited by MR RIZK; 05-20-2011 at 08:45 PM.
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Ok did the smoke test. One leak found on the catch can but no other. Tightened it up and no more leaks.
After the test did the learn procedure however still have the same issue. I replaced the TB with the one from the doner car and did the TB learn but still have issue.
I started the car with the intake pipe off as i don't need the MAF and can see that the butterfly looks to be in the closed position like when the car is off. What else controls the idle in these cars. is there tempreature controlled valve somewhere etc.
Running out of ideas
After the test did the learn procedure however still have the same issue. I replaced the TB with the one from the doner car and did the TB learn but still have issue.
I started the car with the intake pipe off as i don't need the MAF and can see that the butterfly looks to be in the closed position like when the car is off. What else controls the idle in these cars. is there tempreature controlled valve somewhere etc.
Running out of ideas