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Author Topic: HR30 Skyline - running rough after being in storage  (Read 254 times)

tpbftw

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HR30 Skyline - running rough after being in storage
« on: February 09, 2017, 08:52:47 PM »
hey guys, hoping someone here can point me in the right direction....

100% stock standard 1982 Nissan Skyline HR30 Ė L20ET. Was running perfectly fine as a daily driver until put into storage January 2014. Unfortunately I neglected to put in a fuel stabiliser, but did leave the battery on an automatic charger.

Around 18 months later in mid 2015 I started it and got a new WOF, maybe put in some new fuel, maybe not, drove it around for a week then put it back into storage, was running fine.

Fast forward another 18 months and Iím back in the country permanently now and looking to return it to a daily driver, I hopped in and cranked it, battery has heaps of cranking power, but the engine didnít want to fire, gave it a little more throttle than normal and it ran with the engine shaking like an unbalanced washing machine for around 10-20 seconds before I turned it off.

Next I drained the fuel tank, replaced with 20L of 95 octane fuel, replaced fuel filter, then tried again. Engine no longer shaking and but sounds like running on 4 or 5 cylinders. I can now hear the old fuel pump running almost constantly Ė it never used to do this.

Replaced fuel pump with new Bosch pump from NZEFI, looks identical to stock. Still running rough, new fuel pump running almost constantly.

Cleaned fuel injectors using this method: https://www.youtube.com/watch?v=rUUgR94drxg
- this seemed to get it idling a bit better (engine was cold), and at first I thought I had fixed it, could rev it freely when it was cold.

However after a couple minutes of idling and warming up (still sounds like on 5 cylinders) when I give it 1/3rd throttle or more it will hesitate and cut in and out. If I persist with trying to rev it, sometimes it will hesitate, cut out, cut back in then rev nearly freely up to 4000rpm or so. If I try and drive down the street, under 1/3rd throttle or more it will surge violently, cut in and out, if I back off the throttle I can drive it at around 30-40kph but its pretty temperamental.

Next I put in new spark plugs and leads, same symptoms.

Next replaced the AFM with second hand one, disconnected battery, stood on brakes, reconnected battery, same symptoms. Then I took the black cover off and turned it counter clockwise 5-10 clicks to richen the mixture. This seemed to get it to run a little bit better, but after a couple of laps around the block it was back to surging / cutting in and out.

Iíve had a look around general wiring, pulled plugs off and used contact cleaner. Pulled the distributor off, looks fine, the gears at the bottom which I think is the Camshaft Angle Sensor look fine.



Not sure what to do next, what do these symptoms sound like to you? It seems like it gets worse as the car warms up.

As a side note, after installing the second hand AFM now the temperature gauge goes to above hot as soon as you turn on the ignition.


westybob

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Re: HR30 Skyline - running rough after being in storage
« Reply #1 on: February 09, 2017, 09:13:13 PM »
Could be a number of things but maybe get the injectors cleaned and tested.

tpbftw

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Re: HR30 Skyline - running rough after being in storage
« Reply #2 on: February 10, 2017, 09:23:57 AM »
Thanks for the reply westybob. I pulled the injectors and cleaned them using this method: https://www.youtube.com/watch?v=rUUgR94drxg

all 6 spray evenly and appear to work fine, and other than running with old fuel for less than a minute nothing should have changed there, it was running perfectly before being parked up for a couple of years.

With the problem getting worse once it warms up do you think it would be the injectors? I could invest the $120 to have them professionally cleaned but they do appear to be working fine to me. What other things could it be?

I feel like it is some kind of electrical issue, something is cutting the fuel off or killing the spark sporadically when you apply throttle... which is why I went down the AFM and spark plugs and leads path but no luck.

The engine did shake around a lot on the old fuel so wonder if something has come loose, any ideas what to check next? Or could the old fuel have caused the ECU to fail, could that explain the symptoms? I have tried to reset it by disconnecting the battery and standing on the brake pedal for a minute.

westybob

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Re: HR30 Skyline - running rough after being in storage
« Reply #3 on: February 10, 2017, 09:11:38 PM »
I think all you can see visually is that they are working. Balance as in even performance is necessary for good running.

Sorry not familiar with the your car but if it has a distributor give the cap a good clean and look for fine lines that could indicate tracking.

Does your car have two water temp gauges like the RBs? If so disconnect the one for the ecu and see if there is any difference in which case it needs replacing.

If its  getting hot maybe test for head gasket leaking...

Is there a fuel filter in the engine bay that could be replaced?

tpbftw

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Re: HR30 Skyline - running rough after being in storage
« Reply #4 on: February 11, 2017, 09:12:28 PM »
Yeah like I said in the first post pulled the distributor and looked fine, replaced fuel filter too. Not sure on the temp gauge sensor, need to look into that further. Its not a head gasket issue, with the car off and cold if you turn on the ignition the gauge climbs to above hot. Seemed to start after swapping out the AFM, but I put the old one back in and its still doing it.

I used my compressor to blow carb cleaner and fresh fuel through the fuel rail tonight in case of a blockage but no change. Waiting for Repco to give me a call back on a new ignition coil.