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Old 09-16-2018, 12:16 AM   #1
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Default Rough idle with ac OFF. please Help! video inside

1995 pickup.

idle is a bit high around 1100 rpms.

cleaned the MAF with MAF cleaner...

it starts to stumble every few seconds and sometimes stalls.

if I turn the A/C on the idle is steady.

I noticed a higher pitch air sound coming from the hole in the throttle body with the AC on. I think this is the IACV?

car takes a VERY long time to warm up - not sure if this is related?

been spraying carb cleaner all around the throttle body- no difference.

been messing with wiring harness, bending and probing - no difference.

no CEL except for when i unplug the temp sensor in the air cleaner box.

Drives fine. maybe a slight miss but hard to tell.

heres the video:
https://www.youtube.com/watch?v=IPWmz3do_Ns
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Old 09-16-2018, 05:09 AM   #2
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Is the idle at 1100 RPM after the MAF was cleaned?

Have you tried setting the ignition timing?

If the timing is correct, have you tried pulling the codes?
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Old 09-16-2018, 06:35 AM   #3
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Quote:
Originally Posted by jp2code View Post
Is the idle at 1100 RPM after the MAF was cleaned?

Have you tried setting the ignition timing?

If the timing is correct, have you tried pulling the codes?

Not yet. Checking the timing is on my todo list. But I figured if the timing was off it would run badly driving too?

Will the obd1 ecu store codes without a CEL?
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Old 09-16-2018, 02:36 PM   #4
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Originally Posted by max20s14 View Post
Not yet. Checking the timing is on my todo list. But I figured if the timing was off it would run badly driving too?

Will the obd1 ecu store codes without a CEL?
All of the Hardbody Service Manuals say to make sure the Ignition Timing is correct before attempting any repairs. So, make sure that is what it is supposed to be first.

The CEL is typically used to show when the emissions system is messing up. Most OBD1 codes can only be found by counting the blinks on the ECU (see the link on how to check error codes in my signature below).

The 1996-97 Hardbody trucks were OBD2, so you can actually plug in a Code Reader to diagnose the codes.
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Old 09-16-2018, 10:33 PM   #5
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Quote:
Originally Posted by jp2code View Post
All of the Hardbody Service Manuals say to make sure the Ignition Timing is correct before attempting any repairs. So, make sure that is what it is supposed to be first.

The CEL is typically used to show when the emissions system is messing up. Most OBD1 codes can only be found by counting the blinks on the ECU (see the link on how to check error codes in my signature below).

The 1996-97 Hardbody trucks were OBD2, so you can actually plug in a Code Reader to diagnose the codes.
ok I set the ecu to 3 flashes then only got code 41 which is air intake temp sensor. which makes since as it is unplugged.

I just hope its not the head gasket mildly blown between cyls or something
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Old 09-17-2018, 01:25 AM   #6
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A faulty air intake temperature sensor will cause the air/fuel ratio to be off.

Before buying another sensor, check closely that you don't have a bad/corroded contact going to the sensor or that it's not dirty or somehow clogged.
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Old 09-17-2018, 02:45 AM   #7
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If it takes a long time to reach operating temperature your thermostat is probably stuck open. I would only use a genuine Nissan thermostat. I’ve had bad luck with aftermarket thermostats.

Beyond that, like JP said, check the timing with the TPS disconnected. Also check for vacuum leaks around the gasket mating surfaces.
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Old 09-17-2018, 06:26 PM   #8
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UPDATE: Had to drive the truck for longer than usual today. It seems like its worse when it gets thoroughly warmed up.

I noticed some bucking while in gear cruising at about 40 and stalling in neutral

Havnt had a chance to check timing yet.

Heres an updated video of the idle seems worse:

https://www.youtube.com/watch?v=O_Zdz18hOpA
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Old 09-17-2018, 07:58 PM   #9
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Check all your grounds as well. My D21 had rough idle, sputtering, occasional total power loss under accelleration, etc. It turned out to be a bad ground in the engine bay, I can't remember which one exactly, but I basically cut the ends off all the grounds and redid them, then cleaned up all the grounding points and made sure they were secure. After that, no problems.
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Old 09-17-2018, 10:06 PM   #10
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Is there a way to rule out the head gasket?

The oil looks ok on the dipstick and no froth under the cap.

coolant seems a little murky but could be from sitting mabe...

resivior level seems steady.

running with the cap off no bubbles.

or the Idle Air Control valve is there a test to rule this out besides swaping it?

I unplugged it and it just idled lower when I turn the AC on. same hesitation. I assume the iavc plug controlls the up idle when you click AC
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