Need some veteran help please

[macsfamily]

Hello everyone! First post after lurking every day for quite some time. Looking for some advise with my issue. Below is my issue followed by the scanner data. I appreciate any help you may have!!
Car: 87 GN 62,000 miles
All items below completed in last month ( followed "spring cleaning" )
- Coil Pack
- Spark plugs ( NGK Copper )
- Plug wires
- Fuel filter
- Air filter ( OEM )
- Reset IAC and TPS
- Replaced all intake boots and clamps
- New PCV Valve w/ additional check valve
- Oil ( Royal Purple ) and filter ( Wix w/ chk valve )
- Stock fuel pump w/ racetronix hotwire installed
- Cleaned and ohmed all engine bay ground points
- New MAF ( OEM style ) and O2
- RJC power plate
- New adjustable Turbo actuator ( currently set to oem spec )

ISSUE: While driving with little to no boost, I am getting an erratic chk eng light for "O2 lean". It will also do this while at a stand still idling. Watching the scanner, it reads as O2 lean almost always unless I give it some throttle and let off. The car does not idle well and wants to stall out, especially when cold. Any ideas??

Scanner data at idle:
BLM 150
TPS .42v
RPM 975-1025
IAC 16-24v
O2 state LEAN
O2 V .29-.30
MAF 004 G/S
INT 150
CLOSED LOOP
CLNT TEMP 195
AIR FLOW 004 G/S
SPARK ADV 36 degrees
TCC off

 

[CGASTON]

Hello everyone! First post after lurking every day for quite some time. Looking for some advise with my issue. Below is my issue followed by the scanner data. I appreciate any help you may have!!
Car: 87 GN 62,000 miles
All items below completed in last month ( followed "spring cleaning" )
- Coil Pack
- Spark plugs ( NGK Copper )
- Plug wires
- Fuel filter
- Air filter ( OEM )
- Reset IAC and TPS
- Replaced all intake boots and clamps
- New PCV Valve w/ additional check valve
- Oil ( Royal Purple ) and filter ( Wix w/ chk valve )
- Stock fuel pump w/ racetronix hotwire installed
- Cleaned and ohmed all engine bay ground points
- New MAF ( OEM style ) and O2
- RJC power plate
- New adjustable Turbo actuator ( currently set to oem spec )

ISSUE: While driving with little to no boost, I am getting an erratic chk eng light for "O2 lean". It will also do this while at a stand still idling. Watching the scanner, it reads as O2 lean almost always unless I give it some throttle and let off. The car does not idle well and wants to stall out, especially when cold. Any ideas??

Scanner data at idle:
BLM 150
TPS .42v
RPM 975-1025
IAC 16-24v
O2 state LEAN
O2 V .29-.30
MAF 004 G/S
INT 150
CLOSED LOOP
CLNT TEMP 195
AIR FLOW 004 G/S
SPARK ADV 36 degrees
TCC off

What chip? Fuel pressure regulator? Is it happening under boost? Did you properly ground your hotwire kit? If not you will only pull an 7-8 amp charge.

What upgrades have you done to car besides listed above?

 

[Nick Micale]

First thing to do is check fuel pressure at idle and going down the road.

By stock, do you mean original fuel pump? If original, replace it ASAP.

 

[TurboDave]

Your BLM and INT are both pegged at max. There's likely a substantial vacuum leak, or pre turbo exhaust leak to peg them both like that.

MAF is reading a little low, should be closer to 6 at idle with a good OEM MAF. Remanufactured MAF's are badly calibrated and usually read low at idle, and especially low at WOT.

What brand O2? If it's an AC Delco AFS-22, scrap it.

 

[Ttype6]

What MAF meter do you have?

 

[mikestertwo]

What MAF meter do you have?

I agree with the concensus above. Sounds like a miss calibrated MAF. Try to find a known good one or go with a MAF translator/LT1 MAF

 

[lolo86GN]

I had the same problem and it turned out to be a huge vacuum leak from the pcv valve... I would start by plugging up vacuum lines to find the vacuum leak and then move to some of the other readings..

 

[mikestertwo]

The engine is idling around 1000rpm yet the MAF is only reading 4. That's either a bad MAF or a HUGE vacuum leak somewhere between the MAF and intake.

 

[macsfamily]

What chip? Fuel pressure regulator? Is it happening under boost? Did you properly ground your hotwire kit? If not you will only pull an 7-8 amp charge.

What upgrades have you done to car besides listed above?

No other mods other than those listed. I "felt" that the hotwire kit was grounded properly. But, I will measure it. Seems to be fine under boost, but I am not completely sure what "good" is, the car is new to me.

 

[macsfamily]

Thanks everyone! I will look for any vacuum and / or exhaust leaks tonight. I currently have the OEM fuel pump, a reman MAF and I can not recall what brand O2. I have depleted my current funds with the items mentioned, so going with a LS1 Maf and translator is out of reach at the moment. My next intended purchase is a fuel pump.

ALSO, I failed to mention that I installed 100 lb. valve springs. Not sure if this would have an impact?

 

[Pronto]

Where are you located? Maybe someone near could lend you a good MAF to see if that the issue. I haven't hear of anyone getting a reman MAF to work right. Check your vacuum block to make sure it's not cracked. Like Nick said check the fuel pressure. If the pump is crapped out, a hot wire is not going to make better.

 

[macsfamily]

Where are you located? Maybe someone near could lend you a good MAF to see if that the issue. I haven't hear of anyone getting a reman MAF to work right. Check your vacuum block to make sure it's not cracked. Like Nick said check the fuel pressure. If the pump is crapped out, a hot wire is not going to make better.

I am in Salt Lake City. I have talked to Jason at RJC a couple times, maybe he might have something? Thank you for the suggestions!