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RB20DET running on 4 cylinders!?!

JH32

By JH32,
in Engines & Forced Induction

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JH32 Grand Master

JH32

Posted
Posted

My engine is now running only on 4 cylinders, after replacing the head gasket.

It seems as though cylinders 1 and 2 don't want to fire.

I've pulled the coils off and they're sparking, so I thought perhaps the plugs. I swapped plugs 1 and 6 and still the same problem, so it's not the plugs and not the coils.

Which leaves injectors??

What could suddenly be wrong with those?

I had to remove the fuel rail obviously when I replaced the head gasket, but I'm sure everything has gone back in as it came out :confused:

Please help I'm stuck!!

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blind_elk Grand Master

blind_elk

Posted
Posted

Use a long handle screwdriver as a 'stethoscope' to listen to the injectors opening and closing (blade on the injector body, handle against you ear - or ear against the handle, which ever works best for U)

Have you swapped the coils to other cylinders? Are they sparking the plugs ie connect plug to coil to test for spark.

Compression OK?

Steve Grand Master

Steve

Posted
Posted

First I would suggest you do what blind elk suggests, swap the coil packs, they may produce a spark, but how strong?

also, have you checked for earth on the coil pack and leads, it could be that they are only earthing when they are in situ, just giving the impression that all is fine when you pull them to check.

another thing you can try, pull the plug on no1, and disconnect the ignighter - crank the car over and check for fuel smell.

Cecam Enthusiast

Cecam

Posted
Posted

Had that problem before, twice actually now I think about it, it was the old injector loom had got brittle and some wires crapped out so the injectors only fired when you held the loom a certain way... all of the above comments should help you diagnose whats happening thou.

  • 1 year later...
dazzagtr Rookie

dazzagtr

Posted
Posted

Hi i got a similar problem but my r32 is running on 5 cylinders number one cylinder is missfiring the coil packs and plugs are good ive only upgraded fuel pump and malpassi rising rate pressure regulator but i think it might be just the ignighter pack. I got the car tuned for my wolf 3d v4 and the fella said that it was running good but than started to miss fire in number one cylinder. Any one got any suggestions.

yogi000 Mentor

yogi000

Posted
Posted

to determine if it is ur injectors, disconnect each injector, one at a time while the car is running.....if u disconnect it and it make no difference its prboably that injector/s. Try wiggling the connector wires.

Then find out if they are getting any power with a multimeter.

Did you change o rings???? If all is well then move onto ur coils and sparks.

I had a similar problem on a sr20det where the injectors where taken out and put back in the with the same o rings, the used o rings where not providing a good seal and causing it to run like shit. These are side feed not top like the rb20s.

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