wont idel or rev

[gfizzzy]

ok its a brand new motor built forged, head , cams, pte turbo, 880 inj, stock mas, dsm chip,car ran fine on last motor

the problem is the car wont idel I cant even set the ignition timing
1000k to 1500 is all i can get out of it. I checked the MAS, TPS, BISS, compression in case of bad valves, checked the injectoers, unplugged afc and respliced the KARM wires, boost leak tested, switched out MBC, also tryed a stock ecu and it has same problem so ECU is good

pretty much im lost never had a problem like this i could'ent diagnose within a day just looking for a couple idea's or somthing i may have over looked. The thing that drives me crazy is it starts and will hold a 1500 rpms and sounds good and clean, but i let go and it dies i give it gas and it dies. it ran with all same bolt ons, on last motor with no problem nothing has changed except longblock.

 

[GSX93DSM]

Do you have anything else to compensate for the 880's beside afc?

 

[Boost92awd]

With that setup your going to over run the 1G MAS.

 

[GSX93DSM]

I would agree you need to up grade the mass air flow asap. It ran fine with the smaller injectors. Since you got 880's and a built block. I would upgrade that and go from there.

 

[1gDSM4g63]

I think you need to rechip the eprom if you're using the same chip where you ran the 510cc. As I have heard when you go more than 660cc eproms have problems running on an afc.. You do need a fuel pressure regulator and pump.

Make sure your sparkplug and coilpack are config. right.

 

[gfizzzy]

it has dsm chip set up for 1g mas and 880 injectors, aeromotive FPR set at 37psi, and 255 pump, i got a buddy comming over this weekend with ODB1 computer to check it out. after thinking about it i think it is the MAS im goin to swap it out today and see if it runs any better. If i have no luck there i think im goin AEM and getting rid of MAS. Thanks for info ill post tonight, if i figure it out.

 

[gfizzzy]

I got it broken wire on the tps connector TEST AND TUNE TIME thanks for the replys

 

[LandoAWD]

Did you ever have a CEL?

Mark this (Resolved), BTW.

 

[gfizzzy]

still wont idel though