Let's play, Why the hell won't my SR20DET hold idle. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

choleaoum · 08-13-2014, 12:41 AM

Alright so I got my SR20DET running on my 73 510 but it won't hold idle. IACV has been cleaned, and even replaced. TPS has been calibrated and checked. Grounds have been checked for continuity and even added more grounding points with alligator clips. MAF has been changed several times. Tried checking the timing, No vacuum leaks. No loose hoses, No loose IC piping. All new gaskets for intake & exhaust manifold. PCV are hooked up. All wires have been unhooked and checked for corrosion. Temperature sensor is hooked up. It revs up fine, it's running a bit lean. Is there anything I possibly ruled out? The engine was running great before I personally removed it myself from my friends S13.

Cliffs:
- Engine was removed running by me personally and swapped into my 510.
- TPS is calibrated.
- MAF was changed twice.
- Grounds are clean and checked for continuity.
- No vacuum leaks.
- Both manifolds have new gaskets.
- PCV is hooked up.
- Engine stumbles and dies at idle but revs up great. Running lean.
- No corrosion in the wires.
- Temp sensor is hooked up.
- Cleaned IACV & even replaced it.
- ECU have been disconnected and reconnected.

Tried disconnecting IACV runs the same, disconnected the MAF and it runs whatever. Still dies. The IACV is actuating though, we disconnected and watched it.

My next step is to replace the ECU but is there anything I could have overlooked? My wiring looks great, no loose ends. Unless there's a super secret hidden ground wire somewhere.

ultimateirving · 08-13-2014, 03:09 PM

Running lean makes sense as a culprit to it's dying and struggling to idle. What plugs are in there and how long did it sit before you swapped it

choleaoum · 08-13-2014, 06:21 PM

Sat for alittle over a year, plugs are fairly new.

SR20? · 08-13-2014, 06:33 PM

Set the idle a little higher in the ECU, maybe it'll give you a little more time with it running to help look over your data? Maybe try richening it up a bit?

williamb · 08-13-2014, 07:00 PM

Have you tried to keep it running long enough to warm up?

choleaoum · 08-14-2014, 02:10 PM

yeah we revved it for a really long time. no dice.

choleaoum · 08-19-2014, 11:43 PM

fixed it. freddy manifold was causing a leak where the fuel rails mount into the manifold.

08-13-2014, 12:41 AM	#1
choleaoum Zilvia Addict Join Date: Dec 2009 Location: Long Beach, CA Age: 30 Posts: 735 Trader Rating: (7) Feedback Score: 7 reviews	Let's play, Why the hell won't my SR20DET hold idle. Alright so I got my SR20DET running on my 73 510 but it won't hold idle. IACV has been cleaned, and even replaced. TPS has been calibrated and checked. Grounds have been checked for continuity and even added more grounding points with alligator clips. MAF has been changed several times. Tried checking the timing, No vacuum leaks. No loose hoses, No loose IC piping. All new gaskets for intake & exhaust manifold. PCV are hooked up. All wires have been unhooked and checked for corrosion. Temperature sensor is hooked up. It revs up fine, it's running a bit lean. Is there anything I possibly ruled out? The engine was running great before I personally removed it myself from my friends S13. Cliffs: - Engine was removed running by me personally and swapped into my 510. - TPS is calibrated. - MAF was changed twice. - Grounds are clean and checked for continuity. - No vacuum leaks. - Both manifolds have new gaskets. - PCV is hooked up. - Engine stumbles and dies at idle but revs up great. Running lean. - No corrosion in the wires. - Temp sensor is hooked up. - Cleaned IACV & even replaced it. - ECU have been disconnected and reconnected. Tried disconnecting IACV runs the same, disconnected the MAF and it runs whatever. Still dies. The IACV is actuating though, we disconnected and watched it. My next step is to replace the ECU but is there anything I could have overlooked? My wiring looks great, no loose ends. Unless there's a super secret hidden ground wire somewhere.

08-13-2014, 03:09 PM	#2
ultimateirving Zilvia FREAK! Join Date: Nov 2010 Location: arizona Age: 33 Posts: 1,519 Trader Rating: (1) Feedback Score: 1 reviews	Running lean makes sense as a culprit to it's dying and struggling to idle. What plugs are in there and how long did it sit before you swapped it __________________ Z32 with lq4 swap Desert Street Scene \|\| Dssevents.com

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08-13-2014, 06:21 PM	#3
choleaoum Zilvia Addict Join Date: Dec 2009 Location: Long Beach, CA Age: 30 Posts: 735 Trader Rating: (7) Feedback Score: 7 reviews	Sat for alittle over a year, plugs are fairly new.

08-13-2014, 06:33 PM	#4
SR20? Join Date: Dec 2009 Location: Tennessee Age: 29 Posts: 20 Trader Rating: (0) Feedback Score: 0 reviews	Set the idle a little higher in the ECU, maybe it'll give you a little more time with it running to help look over your data? Maybe try richening it up a bit?

08-13-2014, 07:00 PM	#5
williamb Join Date: Aug 2012 Location: Memphis, TN Age: 33 Posts: 49 Trader Rating: (1) Feedback Score: 1 reviews	Have you tried to keep it running long enough to warm up?

08-14-2014, 02:10 PM	#6
choleaoum Zilvia Addict Join Date: Dec 2009 Location: Long Beach, CA Age: 30 Posts: 735 Trader Rating: (7) Feedback Score: 7 reviews	yeah we revved it for a really long time. no dice.

08-19-2014, 11:43 PM	#7
choleaoum Zilvia Addict Join Date: Dec 2009 Location: Long Beach, CA Age: 30 Posts: 735 Trader Rating: (7) Feedback Score: 7 reviews	fixed it. freddy manifold was causing a leak where the fuel rails mount into the manifold.