help with idle after 4k and above
10-12-2009, 07:24 PM
#1
help with idle after 4k and above
WHAT I DID
i tore out the old exhaust. it had a resinator before and after the o2 sensor on the mid pipe. also a resinator on the cat back pipe before the y pipe to the mufflers of my turbo xs catback. all the welds and piping was hacked together . i cut out the resinators and ran straight 3" and the origional turbo xs resinator after the o2 sensor.also removerd the one on the cat back and ran with straight pipe. I also space the o2 sensor off the pipe using the sparkplug anti foulers drilling one to 1/2" and leaving the other alone as it came.
I also made a cai out of 3" od pipe and a spectra stainless steel filter. I put the maf very close to the oem position with a spectra maf pipe adapter also 3 inch. I used 2 screens before the maf in the couplers.
THEN
after these 2 things started good but started to run rough after warm up. i then reved it up and shut it down.
WHAT I DID
came inside to rx8 club and searched came up with cleaning the maf which i did with crc maf cleaner along with washing the intake out with intake cleaner before assembly.
THEN
i had a hard start and very hard running at idle.
WHAT I DID
turned it back off with a rev put the whole stock intake back on after cleaning the maf once again.
THEN
I had a hard start and low idle but stayed put. reved it up past 3.5k fell to 1.5k dropped to .5k and sluggishly caught up and idled fine.
WHAT MY BROTHER DID WHEN I GOT IRRITATED AND WALKED AWAY
my brother was then changing the oil (i have a oil catch can) drained it out snd the pan very little was in the catch can . I put the royal purple but i noticed it was 5-30 instead of the 5-20 didnt think anything of it nor do i think it is a issue. ive been using RP since my oil change at 18k and every 3k since i bought at 17k and now have 28k
WHAT I DID
next i pulled spark plugs. the front housing was dark and had very very fine grit on them the rear were just dark. I then cleaned them with emery paper and a wire brush. next i pulled the fuel pump fuse and turned over the plugs to check for spark all sparked.
NEXT
i went to autozone to rent a obd2 reader well you can only buy one so i did. here are the codes i pulled after i did the brake depress oil guage sweap clear.
P0102_MAF circuit low input
P0172-system too rich bank one whick should be front rotor housing
P0113-intake temp circuit high input
P0456-evap emission control system very small leak
most seem to have come from the intake.
NEXT
i checked all vac lines on the upper intake once again. then i checked the spark plug wire connections 3 snapped on but the front trailing went on and would not snap like the other 3. i jiggled it to see if it made a difference and none.
i went and clear the car the wheel turn right then left the brake 20 time and the mileage depress. also cleared the code with the obd2 let it run at idle. no new codes.
it idled fine reved up and anthing after after 4k it started doing the hard idle pulseating the smoothing out to good idle.
I set it back down with the 2 jacks because im lowered and skirts.
I went for a ride down the street the car had very mild to no hesitation on accereration if not better than before all these issues. anytime the clutch was depressed or at a stop sign the rpms would fall and it would pulsate from 1k to .5k almost die and then pick up pulsationg with the rotor just over 1k and go to normal idle just under one. it did this at every stop sign any time clutch was engaged for enough time to drop to 2-1.5k. never hesitated anywhere in accleration.
i have new plugs on the way and have concidered buying the coils and wires just trying to find a good price other than dealer. i read something about american coils being around 30 each but cant find the product number again.
i really want to do the bhr ignition but need this problem solved before i spend the money there.
im supposed to have a clogged cat on the way from vs8 with no clue where it is called greyhound today, and I never recieved the working one i payed for from RX8 rotory noobie. also have sourced the oem gaskets for after the manifold and after the cat if i need to change to do to the dealer for a new cat and probally a compression test.
if anyone has some kind of solution other than what i have tried ive searched checking the resistance through the coil and wires but havent really found much on a dying coil or even numbers to go off of a good one. thank you
i tore out the old exhaust. it had a resinator before and after the o2 sensor on the mid pipe. also a resinator on the cat back pipe before the y pipe to the mufflers of my turbo xs catback. all the welds and piping was hacked together . i cut out the resinators and ran straight 3" and the origional turbo xs resinator after the o2 sensor.also removerd the one on the cat back and ran with straight pipe. I also space the o2 sensor off the pipe using the sparkplug anti foulers drilling one to 1/2" and leaving the other alone as it came.
I also made a cai out of 3" od pipe and a spectra stainless steel filter. I put the maf very close to the oem position with a spectra maf pipe adapter also 3 inch. I used 2 screens before the maf in the couplers.
THEN
after these 2 things started good but started to run rough after warm up. i then reved it up and shut it down.
WHAT I DID
came inside to rx8 club and searched came up with cleaning the maf which i did with crc maf cleaner along with washing the intake out with intake cleaner before assembly.
THEN
i had a hard start and very hard running at idle.
WHAT I DID
turned it back off with a rev put the whole stock intake back on after cleaning the maf once again.
THEN
I had a hard start and low idle but stayed put. reved it up past 3.5k fell to 1.5k dropped to .5k and sluggishly caught up and idled fine.
WHAT MY BROTHER DID WHEN I GOT IRRITATED AND WALKED AWAY
my brother was then changing the oil (i have a oil catch can) drained it out snd the pan very little was in the catch can . I put the royal purple but i noticed it was 5-30 instead of the 5-20 didnt think anything of it nor do i think it is a issue. ive been using RP since my oil change at 18k and every 3k since i bought at 17k and now have 28k
WHAT I DID
next i pulled spark plugs. the front housing was dark and had very very fine grit on them the rear were just dark. I then cleaned them with emery paper and a wire brush. next i pulled the fuel pump fuse and turned over the plugs to check for spark all sparked.
NEXT
i went to autozone to rent a obd2 reader well you can only buy one so i did. here are the codes i pulled after i did the brake depress oil guage sweap clear.
P0102_MAF circuit low input
P0172-system too rich bank one whick should be front rotor housing
P0113-intake temp circuit high input
P0456-evap emission control system very small leak
most seem to have come from the intake.
NEXT
i checked all vac lines on the upper intake once again. then i checked the spark plug wire connections 3 snapped on but the front trailing went on and would not snap like the other 3. i jiggled it to see if it made a difference and none.
i went and clear the car the wheel turn right then left the brake 20 time and the mileage depress. also cleared the code with the obd2 let it run at idle. no new codes.
it idled fine reved up and anthing after after 4k it started doing the hard idle pulseating the smoothing out to good idle.
I set it back down with the 2 jacks because im lowered and skirts.
I went for a ride down the street the car had very mild to no hesitation on accereration if not better than before all these issues. anytime the clutch was depressed or at a stop sign the rpms would fall and it would pulsate from 1k to .5k almost die and then pick up pulsationg with the rotor just over 1k and go to normal idle just under one. it did this at every stop sign any time clutch was engaged for enough time to drop to 2-1.5k. never hesitated anywhere in accleration.
i have new plugs on the way and have concidered buying the coils and wires just trying to find a good price other than dealer. i read something about american coils being around 30 each but cant find the product number again.
i really want to do the bhr ignition but need this problem solved before i spend the money there.
im supposed to have a clogged cat on the way from vs8 with no clue where it is called greyhound today, and I never recieved the working one i payed for from RX8 rotory noobie. also have sourced the oem gaskets for after the manifold and after the cat if i need to change to do to the dealer for a new cat and probally a compression test.
if anyone has some kind of solution other than what i have tried ive searched checking the resistance through the coil and wires but havent really found much on a dying coil or even numbers to go off of a good one. thank you
Last edited by bumblebeerx8; 10-12-2009 at 07:59 PM.
10-13-2009, 06:43 PM
#7
Only some '04 models have actually got it to work, but the same reason as to why some '04 models can run cat-less with not CEL and without an anti-fouler.
I used to do that before I bought my AccessPort.
You've done so much to your car that its probably multiple issues.
Some of the things you've done was unnecessary, but we won't get into that now and just focus on the codes you have.
These two codes point to the MAF housing since both readings are taken from that location.
Check the wire harness connection for any breaks in the cable.
You can also check each wire for continuity from that harness to the PCM.
Also, if you know another RX8 owner near you, ask to borrow his MAF and see if those two codes go away.
We see this code associated with a loose/bad gas cap.
10-13-2009, 08:11 PM
#8
^thanks ive but 20 miles on it after clear the codes and no new codes have came up ive looked over the maf and wires apear to be good haven't checked with a multimeter though. i do have a front 02 sensor from another header i bought awhile back i could try. but then again i have not got any new codes come up. i may drive it around some more and see if i get anything new. could bad gas or the new oil cause the idle issue. that is the only thing that is left present at this point
Last edited by bumblebeerx8; 10-13-2009 at 08:13 PM.
10-13-2009, 08:29 PM
#9
I've heard that others have gone 300+ miles before the CEL illuminated.
The basics on troubleshooting is looking at what you've done recently and any changes you've made.
Since you messed with the intake and exhaust and now have CEL codes associated with those, you need to look there and stop thinking its something else.
The way your engine runs is based off of readings from the MAF and O2 sensor (basically) and a failure in one (or both) will cause idle issues.
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