Quote:
Originally Posted by adey
Bump for a user with a similar problem!
Links to the youtube video of the issue:
https://www.youtube.com/watch?v=vlDRKj5kZh4
AFs are all over the place, although it seems to lean to the lean side (har har). yet, sometimes it will go down to super rich! Maybe a pinched injector O-ring?
Checked all the vac hoses that I have (not many) and re-tightened all intake/IC/throttle piping...
checked MAF wiring, seems to be no issue. startup is strong and instant, the damn thing just won't idle!
Holding the throttle still and trying to keep constant RPMs doesn't work -- the rpms will hit whatever I'm aiming for, and then within a second the revs start to fall, even though my foot is stable on the gas.
Since the video I installed a Tomei FPR and set to about 3.3 bar, it made no difference.
Details:
1998 S13 blacktop sr20det
S15 T28 dual bb turbo
Z32 MAF
Stock Compression
Nismo 555cc injectors
Walbro 255lph fuel pump
HKS wastegate actuator
Tomei exhaust manifold
Tomei adjustable fpr (small) |
looks like it needs tuning. You never mentioned what ecu is in it.
If you are incapable of tuning whatever it is yourself, go back to the OEM injectors/maf/ecu first, and re-check your wideband's report.
The reason I suggest this is because the problem you see there could be any number of things, including but not limited to,
1. bad maf (probably not)
2. bad wideband (doubt it)
3. exhaust leak (unlikely)
4. air/boost leak (very unlikely, but check pre-turbo for a leak,
for sure)
5. fuel pressure issue (due to regulator/pump, also unlikely)
6. injectors are not actually 550's
7. injector lag time is wrong in the computer
8. other stuff
Most of it is unlikely, however by swapping back to OEM parts and verifying the idle is back to "normal", you would eliminate
most of it as potential sources, and you can focus on the real problem: the computer (or injector size)