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Rb25det Running Rough, Rich And Smokey After S15 Injector Install.

Peter

By Peter,
in Engines & Forced Induction

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STATUS Grand Master

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I only ran it for 20 or so seconds...maybe (hopefully this will be the issue?) How does the fuel get dumped in the cylinder when you remove the injectors? When I pulled out the stock rail and injectors no fuel came out until I popped out the stock injectors - then the rail was quite dry when I put in the S15 ones?

Ahh i always leave the rail in place, when changing injectors, save alot of time (we do round 3 sets a week).

Peter Community Regular

Peter

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OK....well I got off work early today, so had a chance to play with the PFC....

Adjusted the injectors' % and lag times to the recommended values (tried everything in this thread) without success. Also dropped all of them right back to 25% - the AFR increased slightly to around 13 - 14, but it was still running rich, idling really rough, missing (?) when revved, and blowing smoke (fuel) out the exhaust....

I'll take the injectors and fuel rail out on Saturday and take it to a fuel injection shop....

When I take it to the shop what should I ask for, or ask them to do?

Can anyone recommend any fuel injections specialists around Perth, WA?

Thanks,

Peter

Birnie Veteran

Birnie

Posted
Posted

I don't suppose you accidently changed your AFM setting in the Power FC ?

I did that once when poking around and rang my tuner staight away thinking i'd ruined my $500 tune.

Mine was blowing black smoke and so rough it was ridiculous.

That was the 1st thing he said to check.....i accidently flipped it to something other than standard R33, flicked it back and hew presto! Just an idea.....good luck

Peter Community Regular

Peter

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Thanks for the suggestion Birnie.

No AFM is still the same, I have a Z32 and this is selected within the AFM menu.

Thanks for the suggestion anyways!

Pete

STATUS Grand Master

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Posted (edited)

ill still bet money its a nicked o-ring on the injectors.....

I have said it before in this thread THE CAR WILL RUN FINE WITH THE INJECTORS SET TO 100% IN THE PFC AS THEY ARE ONLY SLIGHTLY BIGGER THAN STD 440 up from 370cc..... You have another issue, nicked or incorrect oring.... i see this about 3 times a week @ my shop from guys incorrectly fitting them themselves.

Edited by URAS
Peter Community Regular

Peter

Posted
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ill still bet money its a nicked o-ring on the injectors.....

I have said it before in this thread THE CAR WILL RUN FINE WITH THE INJECTORS SET TO 100% IN THE PFC AS THEY ARE ONLY SLIGHTLY BIGGER THAN STD 440 up from 370cc..... You have another issue, nicked or incorrect oring.... i see this about 3 times a week @ my shop from guys incorrectly fitting them themselves.

Yeah, I think this is the issue....pulled the fuel rail with injectors out today and there was fuel leaking around the pintle caps. Left the fuel rail sitting in the sink for a while, and a few of the injectors continued to leak fuel from around the pintle caps...must be the o-rings...

I don't understand though...I bought the right o-rings, fitted them, and as the injector shop recommended, sprayed a bit of WD40 on them and slid them into the rail...they weren't sticking or anything... I did the final tighten with the end caps and screws....oh well...off to the injector shop to get them to fit, clean and flow...

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