IDLE and BOOST problem. I tried everything!

[syndr0me]

Hey guys, So I had a previous thread. It kind of died. No one else is replying but me but to avoid confusion, I'm gonna start a new one and I believe I've narrowed it down quite a bit.
To recap:

-Fresh GAS
-Fresh Plugs, BPR7ES .028" gapped
-Tried different PTUs
-Checked spark plug wires for arching and schocks
-Did a boost leak to 25+psi
-No vacuum leaks on intake tube
-Checked compression, 150 all 4 (Little low but OK)
-I pulled the ECU and everything looks good (no bad caps, or bunt ground traces etc)

My mods:
- 6 Bolt
- 2g 609 MAF
- FIC 650
- Wally 190
- DSMLink V1

Additional Notes:
- Deadtime 210us
- Idle 850RPM set in Link
- Invert CAS
- TPS volts and % in check
- Cam marks line up


SYMPTONS

!!Rough IDLE and UNDER BOOST!!

Notes @ IDLE:

- Rough Idle around 550-650RPM
- MAF ~21Hz, 0.19gm/rev <- I believe this is important to notice!
- Timing at 13.1 steady <- shouldnt be that
- 16 inHg <- autometer gauge, off a little tho

Notes @ BOOST:

- MAF Hz climbs to ~500hz around 3500RPM then drops to ~60hz once it gets into ~5+psi boost <- I believe this is important to notice!
- Car boogs hard
- Showed an IAT error in LINK (only once though)

CAR DOES NOT RUN WITH MAF UNPLUGGED <- WHY IS THAT???

!!!I ACQUIRED ANOTHER 609 MAF AND IT DID NO RESOLVE THE ISSUE!!!


- Rewired MAF ground (was 20Ohm, now 1.8Ohm)
- Pin 3&4 show their correct voltages (I believe it was pin 3&4)
- Connector seemed fine and rust free
- All pins on MAF show low Ohms(2<) all the way to the ECU


I hope I supplied all relevant information!!

Please help me!!!!!

Thanks!!

**NOTE** I'd love to supply a log, but the really old laptop has no internet and USB thumb drives don't work (Windows 98).

 

[KFred 513]

I didn't read through your other thread, but I can offer simple advice. Inspect your wiring and connectors entirely. Sometimes a problem that doesn't make a whole lot of sense is just a bad wire somewhere.

You mentioned the timing is holding constant, did you try swapping in a different cas to rule that out? Check base timing at 5*? Ensure the bolts on the CAS are tight and it isn't shifting around on you? Just trying to throw some ideas your way.

Pull back some loom and make sure everything checks out.

 

[syndr0me]

I didn't read through your other thread, but I can offer simple advice. Inspect your wiring and connectors entirely. Sometimes a problem that doesn't make a whole lot of sense is just a bad wire somewhere.

You mentioned the timing is holding constant, did you try swapping in a different cas to rule that out? Check base timing at 5*? Ensure the bolts on the CAS are tight and it isn't shifting around on you? Just trying to throw some ideas your way.

Pull back some loom and make sure everything checks out.

Hmm yes, the contant timing at 13.1deg anoys me. I've alos noticed this:

- When the car is cold and I let it warm up. It holds idle and timing fluctuates as usual.

- When I warm start the car, the timing automatically locks to 13.1deg and idles at 650rpm,