Jump to content
SAU Community

Recommended Posts

My brother has just done his timing belt. It was done the correct way by aligning number 1 cylinder to TDC. The CAS is in the same position as before. Checked timing and it was in the correct range.

Now when the car's started, it's only running on 5 cylinders. Number 1 cylinder is down (figured out by pulling the connector on #1 coilpack while it was running).

So the sparkplug was checked and it's making spark. #1 coilpack was swapped with another one and yet #1 cylinder still doesn't fire.

The car was running fine before the timing belt change. It has aftermarket turbo and powerfc.

What else could the problem be and how could i go about diagnosing it?

Any help appreciated.

Scott

Link to comment
https://www.sau.com.au/forums/topic/50728-rb20det-down-1-cylinder-why/
Share on other sites

An engine needs three things to run - air, fuel and spark. You've ruled out spark, and we can safely assume it's getting air unless you have a sock or something jammed into the intake runners :P So I'd assume it's a fuel issue. Check that the injector is firing, perhaps swap #1 with one of the others and see if the problem follows the injector, or whether it's in the wiring or ECU (unlikely) somewhere.

If it were a cam timing problem I expect the problem would be consistent across all six cylinders, or at least move between them erratically. The same goes for CAS, TPS and just about any of the other sensors.

When I did mine I pulled everything off and lined all the marks up (crank, cam gears)

Pulled the belt off and slipped the new one on (was a nissan one so it had the markings on the belt) I also discovered it was one tooth out on the crank.)

Easy peazy japanezy.

On the dyno it lost a tinny bit of top end but picked up some much needed bottom end.

So your definately getting spark to cyl 1 then?

Stuffed ignition module or wiring to cyl 1?

Thanks Marc & Joel. All comments taken on board.

Marc, the last time it was running (before timing belt), there were no problems. So i'd have to think that the injectors are fine. FYI, they are 550cc RX7 ones and have been tested and only been in the car about a month.

Joel, i was maybe thinking the ignitor module myself. As you know, you have to take the module off to get to the coilpacks, so in doing this the associated wiring to the module was moved around as well. I notice that the wiring is a bit stiff...prolly from years of heat. I'll pass this info on to him.

Regards,

Scott

Did you test for spark using the plug in #1? Or did you use a spare plug? Try moving #1 plug to a different cyl and see if the problem follows it. Also, do a compression test (you might have done something nasty like bend a valve while re-aligning the cams and crank).

Did you get wet and a dry compression test results?

This may help determine if the problem is in the top or bottom end.

Whilst I have never looked at the rings on a skyline, I have seen other cars suddenly develop huge drops in compression when the rings turn on the piston and all of the ring gaps line up (nearly all pressure blows past the rings) but this can come good again as the rings move back around.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Pads for R32 GTS-t, R32 GT-R non V-Spec (Sumitomo), R33 GTS-t and R34 GT-t are all interchangeable. R34 GT uses a 2x piston caliper, hence it didn't fit.
    • Checked with amayama and nope, the full S2 manual set is not available anymore. Unsurprising, but still disappointing as the ? on availability gave a glimmer of hope.
    • I've heard the Tomei USA head gaskets are decent if you want to o-ring the heads but otherwise not recommended.
    • The 296mm rotors are the R33 turbo brakes. The 310mm rotors are the R34 turbo brakes. The calipers are nearly the same, but not. They're the same caliper but the R34 caliper has longer legs so that it sits out far enough to go over the rotor. The pads are the same for both. When you say, "I bough tsome EBC"....did you just mean pads? Or rotors? 310mm rotors fit under 17" wheels. There may be some wheels without enough clearance though. I can't fit my fingers between the barrel of my wheel and the "corners" of my R34 calipers, but there is plenty of room behind the spokes. This is on Enkei RPF1. You can fit 324mm rotors inside a 17" wheel, but I'd be willing to bet that it would be close to impossible with the Nissan/Sumitomo caliper (using an adapter, of course), because the Sumitomo caliper is fatter than the Brembo caliper that is supposed to go on the 324mm rotors.
    • Hi. Can someone tell me what brakes(and mainly WHERE) can i buy brakes on R34 GTT? I bought some EBC which SHOULD go on my car(i have GT but it has GTT brakes) but it does not fit, Brakes are "too" small(296mm) Are 310mm be good or? I have 17 inch wheel so no "big boys" but for me driving i just need one that fits and i can get here in EU/Czech.
×
×
  • Create New...