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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 12-07-2018, 09:13 PM   #1
xpinoyxmk
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sr20 sounds as if its running on 3 cylinders

Need help.

Little background:

Went in for a car alignment last week, everything was good. Then yesterday I go to start the car and it sounds like a subaru, rev a couple times, very difficult to rev and it breaks up bad, and smoke coming out of the exhaust (heavy fuel smell). Caught me off guard, my assumption is that its running on 3 cylinders, so I go thru the regular procedure.

Spark, begin unplugging each connector to each coil pack, with #1 unplugged nothing changes, all others have a noticeable difference.

Fuel, same with pulling the connector. All have a slight but noticeable difference. Pulled the rail to see if the injectors are leaking or stuck open. They check out all good.

Checked for air/boost leaks, none.

Pulled the valve cover to see if anything was loose or a rocker arm fell off. Nope nothing.

Decided to test to see if anything changed if i pulled the fuel pump fuse. Normally it should die pretty fast... Nope, begins to idle normally except at 2000 rpms and stays running until i try to rev, then it will die. I assume its only running good because the excess fuel is burning off. Also longest i let it run, after pulling the fuel pump fuse, until I would rev it is about 30 sec.

Z32 mafs has been verified good. With it unplugged, there is no change for the better or worse. Also my tuner said the stock fpr's could be the issue.

If anyone has any information that could help, I'd greatly appreciate it.

Details on my car for reference:

180sx, original sr20, gtx2867r, hks 740cc, z32 mafs, enthalpy tune

Edit:
-swapped coil packs between #1 and #2, no change still on #1 unplugged
-replaced spark plugs with bkr7e's, gapped at .028, no change

Unsure if this is related but my fuel pump stopped priming/working for a short time.

Last edited by xpinoyxmk; Yesterday at 11:58 AM..
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Old 12-07-2018, 09:16 PM   #2
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Did you swap coil packs around to see if the dead cylinder followed the #1 coilpack? It's a pretty common failure.
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Old 12-07-2018, 09:23 PM   #3
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Originally Posted by e1_griego View Post
Did you swap coil packs around to see if the dead cylinder followed the #1 coilpack? It's a pretty common failure.
Yes I swapped #1 and #2. Still was the same on #1.
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Old 12-07-2018, 10:34 PM   #4
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Originally Posted by xpinoyxmk View Post
Yes I swapped #1 and #2. Still was the same on #1.
Take spark plugs out and check them all
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Old 12-08-2018, 11:41 AM   #5
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Take spark plugs out and check them all
Ended up replacing them too. No change.
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Old 12-09-2018, 12:55 AM   #6
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You getting any codes from the ECU? I'm having the same issue and I've narrowed it down to the knock sensor.

Haven't gotten to it yet, so I'm not 100% sure, but both our cases seem like a knock sensor issue. Breaking up bad when revving. Although for me it only happens under load. Check if your ECU is throwing code 34.

Oh and if your fuel pump stopped priming, it might be an electrical issue. I had the ground on my alternator go bad, which made everything go whack.
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Old Yesterday, 11:54 AM   #7
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happened to me when had coupler on intercooler come loose...
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Old Yesterday, 11:57 AM   #8
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Quote:
Originally Posted by Quiche2192 View Post
You getting any codes from the ECU? I'm having the same issue and I've narrowed it down to the knock sensor.

Haven't gotten to it yet, so I'm not 100% sure, but both our cases seem like a knock sensor issue. Breaking up bad when revving. Although for me it only happens under load. Check if your ECU is throwing code 34.

Oh and if your fuel pump stopped priming, it might be an electrical issue. I had the ground on my alternator go bad, which made everything go whack.
No way to check codes. Your issue is most likely different since its only under load.

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happened to me when had coupler on intercooler come loose...
All couplers are good. No leaks.
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