Idle issue
May 30, 2020, 08:12 PM
#1
Newbie
Thread Starter
Idle issue
Hey guys
im positive some people had this same issue as I’m experiencing right now pretty sure it’s been covered but can’t seem to find any on the web or forums
anyways been having this issue ever since i got my car fixed up from a bent rod
broke in my car normally no hard accelerations or anything followed the break in and all
ima cut to the point so my idle will be funny on idle it’ll be at 1k steady for a bit than surge a tiny bit like if it has hiccups it’ll go from 1k to let’s say 700 rpms than bounce between that range let’s say 3 times than goes back to steady 1k and repeat
changed the sparks and had a shop look at it to find what’s the issue they re gapped my plugs to .24 i think ? ( i was tuned by this shop and got rebuilt by them) got told they couldn’t find the issue i told them as well about a issue i have that whenever i full WOT from 3rd to 4th it’ll hesitate 3rd from6-7k rpms it’ll kinda bog but once i hit 4th and go from 5-7k it’ll legit shake the whole damn car and feel like I’m losing power than 5th will smooth out
again sparks are brand new , coil packs are semi newishhh and i keep getting “random misfire code” but never pops up on my dash it’s only stored in the ecu
i recently pour in fuel system cleaner im thinking it could be my fuel injectors are clogged ? Legit feels like when I’m going full wot thru all the gears only 4th seems to have a problem high in the rpms
i was screwing around on my Bluetooth ob2 that has gauges in the app this is what i got info from
spark timing advanced is ranging 8-12 on idle
air fuel commend ratio (i don’t have a real a/f gauge which i should get ASAP) doing a full
wot 3rd pull is .76 from what i remember
Calculated engine load % on idle Is 23-25%
i just disconnected the battery just to make sure my ecu isn’t tripping
i will clean MAF sensor as well tomorrow
what do you guys think ??
mods
ETS CAI
stock intercooler
ETS upper and lower intercooler piping
grim speed 3 port boost solenoid
recirc downpipe or stock ?? Don’t know
HKS dual catback
does have aftermarket injectors but i don’t know what kind fuel pump i don’t know as well
im positive some people had this same issue as I’m experiencing right now pretty sure it’s been covered but can’t seem to find any on the web or forums
anyways been having this issue ever since i got my car fixed up from a bent rod
broke in my car normally no hard accelerations or anything followed the break in and all
ima cut to the point so my idle will be funny on idle it’ll be at 1k steady for a bit than surge a tiny bit like if it has hiccups it’ll go from 1k to let’s say 700 rpms than bounce between that range let’s say 3 times than goes back to steady 1k and repeat
changed the sparks and had a shop look at it to find what’s the issue they re gapped my plugs to .24 i think ? ( i was tuned by this shop and got rebuilt by them) got told they couldn’t find the issue i told them as well about a issue i have that whenever i full WOT from 3rd to 4th it’ll hesitate 3rd from6-7k rpms it’ll kinda bog but once i hit 4th and go from 5-7k it’ll legit shake the whole damn car and feel like I’m losing power than 5th will smooth out
again sparks are brand new , coil packs are semi newishhh and i keep getting “random misfire code” but never pops up on my dash it’s only stored in the ecu
i recently pour in fuel system cleaner im thinking it could be my fuel injectors are clogged ? Legit feels like when I’m going full wot thru all the gears only 4th seems to have a problem high in the rpms
i was screwing around on my Bluetooth ob2 that has gauges in the app this is what i got info from
spark timing advanced is ranging 8-12 on idle
air fuel commend ratio (i don’t have a real a/f gauge which i should get ASAP) doing a full
wot 3rd pull is .76 from what i remember
Calculated engine load % on idle Is 23-25%
i just disconnected the battery just to make sure my ecu isn’t tripping
i will clean MAF sensor as well tomorrow
what do you guys think ??
mods
ETS CAI
stock intercooler
ETS upper and lower intercooler piping
grim speed 3 port boost solenoid
recirc downpipe or stock ?? Don’t know
HKS dual catback
does have aftermarket injectors but i don’t know what kind fuel pump i don’t know as well
Jun 4, 2020, 08:41 AM
#2
Newbie
Join Date: Apr 2009
Location: South Orange County, CA
Posts: 17
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I have a similar, but not as extreme issue. Burbles/rough idle flutters between 950 and 750 without any rhythm, burble continues when holding a higher RPM in neutral.
Compression test #s: 145 to 150 on all cylinders dry, 175-180 wet.
Leak down test: 4%-6% on all cylinders.
Originally had boost leaks, but now all fixed and PCV valve replaced.
Spark plugs all look OK and gapped to OEM spec NGK.
One interesting note: Idle vacuum is at 18inHG at normal operating temperature, however after a few moderate accelerations into boost, the idle vacuum begins to drop. It ends up around 11-12 inHg after some time. Off throttle decel is also lower vacuum (18 inHG vs 23 inHG normally) and the engine braking is not as strong. I don't think its a vacuum leak because when this is happening, ill shut off the car and turn it back on, and vacuum is instantly back to normal. The vacuum drift happens then happens again after a while.
Only thing i haven't checked yet is injectors and coils.
As for the OP, i think we may be in the same realm here and and since you say your coils are newish, my guess is it may be the injectors. Hopefully someone can chime in. Keep me posted on the results after cleaning your MAF.
Compression test #s: 145 to 150 on all cylinders dry, 175-180 wet.
Leak down test: 4%-6% on all cylinders.
Originally had boost leaks, but now all fixed and PCV valve replaced.
Spark plugs all look OK and gapped to OEM spec NGK.
One interesting note: Idle vacuum is at 18inHG at normal operating temperature, however after a few moderate accelerations into boost, the idle vacuum begins to drop. It ends up around 11-12 inHg after some time. Off throttle decel is also lower vacuum (18 inHG vs 23 inHG normally) and the engine braking is not as strong. I don't think its a vacuum leak because when this is happening, ill shut off the car and turn it back on, and vacuum is instantly back to normal. The vacuum drift happens then happens again after a while.
Only thing i haven't checked yet is injectors and coils.
As for the OP, i think we may be in the same realm here and and since you say your coils are newish, my guess is it may be the injectors. Hopefully someone can chime in. Keep me posted on the results after cleaning your MAF.
Jun 4, 2020, 09:09 AM
#3
Newbie
Thread Starter
I have a similar, but not as extreme issue. Burbles/rough idle flutters between 950 and 750 without any rhythm, burble continues when holding a higher RPM in neutral.
Compression test #s: 145 to 150 on all cylinders dry, 175-180 wet.
Leak down test: 4%-6% on all cylinders.
Originally had boost leaks, but now all fixed and PCV valve replaced.
Spark plugs all look OK and gapped to OEM spec NGK.
One interesting note: Idle vacuum is at 18inHG at normal operating temperature, however after a few moderate accelerations into boost, the idle vacuum begins to drop. It ends up around 11-12 inHg after some time. Off throttle decel is also lower vacuum (18 inHG vs 23 inHG normally) and the engine braking is not as strong. I don't think its a vacuum leak because when this is happening, ill shut off the car and turn it back on, and vacuum is instantly back to normal. The vacuum drift happens then happens again after a while.
Only thing i haven't checked yet is injectors and coils.
As for the OP, i think we may be in the same realm here and and since you say your coils are newish, my guess is it may be the injectors. Hopefully someone can chime in. Keep me posted on the results after cleaning your MAF.
Compression test #s: 145 to 150 on all cylinders dry, 175-180 wet.
Leak down test: 4%-6% on all cylinders.
Originally had boost leaks, but now all fixed and PCV valve replaced.
Spark plugs all look OK and gapped to OEM spec NGK.
One interesting note: Idle vacuum is at 18inHG at normal operating temperature, however after a few moderate accelerations into boost, the idle vacuum begins to drop. It ends up around 11-12 inHg after some time. Off throttle decel is also lower vacuum (18 inHG vs 23 inHG normally) and the engine braking is not as strong. I don't think its a vacuum leak because when this is happening, ill shut off the car and turn it back on, and vacuum is instantly back to normal. The vacuum drift happens then happens again after a while.
Only thing i haven't checked yet is injectors and coils.
As for the OP, i think we may be in the same realm here and and since you say your coils are newish, my guess is it may be the injectors. Hopefully someone can chime in. Keep me posted on the results after cleaning your MAF.
i haven’t cleaned my MAF yet but the hard reset (disconnecting the battery overnight ) and the fuel system cleaner made my idle slight better i have a feeling it could be my and your injectors idk about the vacuum pressure u mention but the chevron fuel system cleaner honestly made my car slight better will use another bottle when I’m on empty but i will come back to clean my MAF today I’ll keep you updated if the maf did anything
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