SOHC MAF/idle issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Jayooheeewhy · 12-25-2013, 12:44 AM

My first thread, always looked here for help and though i'd make an account.
I have A Ka24e, hooked up a cold air intake, didn't have a spot for the MAF sensor so I hooked it up without it, started up fine but died after some time and wouldn't rev past 3k, once i hooked up the sensor it would turn over and die almost immediately. Not sure if its a bad sensor? If i need to relearn the ECU or if its the IAC.

1989 240sx, SOHC, full EGR/vacuum delete, AC delete, rebuilt head, bolt ons.

frankies1390 · 12-25-2013, 02:53 AM

did they not provide the MAF adapter? it needs to be in line so it can read ur air/fuel to give your ecu the info. hopefully u didnt fry the MAF. unhook your battery for a couple minutes and try adapting ur MAF to the intake tube. it needs to be sealed so all the air is passed through the sensor inside the MAF.

frankies1390 · 12-25-2013, 02:53 AM

or are u talking about the intake temp sensor?

Jayooheeewhy · 12-27-2013, 03:19 AM

I'm talking about the MAF, they didnt provide an adapter but i ordered one and its coming in soon so i'll hook that up but i dont have a sealed spot for the actual little sensor, where do i screw that to? Just drill a hole in the tubing and screw it in or are there adapters? And wheres the Intake temp sensor located?

Jayooheeewhy · 12-28-2013, 07:11 PM

UPDATE

Maf and intake air sensor are hooked up and car revs fine but wont idle. Could it be my IACV?

kruked · 01-03-2014, 07:27 PM

IACV would be the first place to start

Jayooheeewhy · 01-06-2014, 12:42 PM

Quote:

Originally Posted by kruked

IACV would be the first place to start

I clean the valve and reconnected everything and checked tbe ignition. What else could cause it die? Air fuel ratio?

bmxer882x · 01-06-2014, 02:40 PM

Did you try disconnecting the battery and letting the computer reset like suggested above?

Jayooheeewhy · 01-06-2014, 10:32 PM

Quote:

Originally Posted by bmxer882x

Did you try disconnecting the battery and letting the computer reset like suggested above?

Tried, recharged the battery, tested starter and got new sparkplugs to make sure the start was fine. I'm going to check grounds, tps and maf tomorrow and see what happens.

frankies1390 · 01-06-2014, 03:15 PM

If you've done everything stated above and it still dies, ur maf sounds dead. Keep ur maf plugged and disconnect the TPS located on the side of ur throttle body. See if there is a change in the time it stays running. Then vice/versa unplug ur maf and leave ur TPS plugged in. This will ultimately tell u if u have a bad sensor between the 2. Check ur engine grounds on intake manifold. The engine is grounded throughout the loom to 2 ground spades on the harness. I've had ecu failure as I thought it to be. Turns out the spades or connectors were broken.

12-25-2013, 12:44 AM	#1
Jayooheeewhy Join Date: Dec 2013 Location: Bay area California Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	SOHC MAF/idle issue My first thread, always looked here for help and though i'd make an account. I have A Ka24e, hooked up a cold air intake, didn't have a spot for the MAF sensor so I hooked it up without it, started up fine but died after some time and wouldn't rev past 3k, once i hooked up the sensor it would turn over and die almost immediately. Not sure if its a bad sensor? If i need to relearn the ECU or if its the IAC. 1989 240sx, SOHC, full EGR/vacuum delete, AC delete, rebuilt head, bolt ons.

01-03-2014, 07:27 PM	#6
kruked Nissanaholic! Join Date: Feb 2012 Location: Clearwater, Fl. Posts: 2,293 Trader Rating: (37) Feedback Score: 37 reviews	IACV would be the first place to start __________________ S13 coupe, KA-t

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

12-25-2013, 02:53 AM	#2
frankies1390 Zilvia Junkie Join Date: Nov 2010 Location: Eugene Posts: 446 Trader Rating: (9) Feedback Score: 9 reviews	did they not provide the MAF adapter? it needs to be in line so it can read ur air/fuel to give your ecu the info. hopefully u didnt fry the MAF. unhook your battery for a couple minutes and try adapting ur MAF to the intake tube. it needs to be sealed so all the air is passed through the sensor inside the MAF.

12-27-2013, 03:19 AM	#4
Jayooheeewhy Join Date: Dec 2013 Location: Bay area California Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	I'm talking about the MAF, they didnt provide an adapter but i ordered one and its coming in soon so i'll hook that up but i dont have a sealed spot for the actual little sensor, where do i screw that to? Just drill a hole in the tubing and screw it in or are there adapters? And wheres the Intake temp sensor located?

12-28-2013, 07:11 PM	#5
Jayooheeewhy Join Date: Dec 2013 Location: Bay area California Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	UPDATE Maf and intake air sensor are hooked up and car revs fine but wont idle. Could it be my IACV?

01-06-2014, 02:40 PM	#8
bmxer882x Zilvia Junkie Join Date: Apr 2013 Location: chandler Age: 31 Posts: 370 Trader Rating: (3) Feedback Score: 3 reviews	Did you try disconnecting the battery and letting the computer reset like suggested above?

01-06-2014, 03:15 PM	#10
frankies1390 Zilvia Junkie Join Date: Nov 2010 Location: Eugene Posts: 446 Trader Rating: (9) Feedback Score: 9 reviews	If you've done everything stated above and it still dies, ur maf sounds dead. Keep ur maf plugged and disconnect the TPS located on the side of ur throttle body. See if there is a change in the time it stays running. Then vice/versa unplug ur maf and leave ur TPS plugged in. This will ultimately tell u if u have a bad sensor between the 2. Check ur engine grounds on intake manifold. The engine is grounded throughout the loom to 2 ground spades on the harness. I've had ecu failure as I thought it to be. Turns out the spades or connectors were broken.