gas on top of pistons

[capowered240]

I took the spark plugs out today just to look at them and I looked down the spark plug hole and on all of the pistons they are wet on top. Also, on the #4 spark plug it was wet.

[jt15833]

whats ur fuel/maf situation? injectors/pump/regulator wise

[capowered240]

everything is stock with kae maf. stock fuel pump.

[AeonTorpor]

Leaky injectors? Busted Injector O-rings?

[dattodude]

leaky injector...get it sorted..definitely leaky injector. To see petrol means they are VERY leaky.

leftover pressure in fuel line, is pushing past the closed injector.

Won't be anything else, will probobably sort itself after a good removal/cleaning by specialist.

This sort of problem will cause backfiring on acceleration after sitting at the lights, and difficulty to start after stopping at the shops for some milk or cigarettes.

Cheers,Chris

With an aftermarket computer, this sort of thing can lead to you burning the top out of the other 3 pistons.

[capowered240]

Alright, so what is the best solution for this matter. Well I guess either change them out or get them cleaned out. What do you'll think?

[AeonTorpor]

First, check the resistance of the injectors. All you need is a ohmmeter. Just disconnect the Injector from the harness and measure the resistance of the injector. It can be anywhere from 3-12 ohms (i've heard 3, but 12 is ok). If its higher than that then the injector is dead.

If all the injectors check out then you'd want to follow procedure to removing the injectors and check if the 2 o-rings on each injector isn't all mutalated. If all the o-rings are fine, then that means the injectors themselves are what is leaking, and in which case you'd replace whatever injectors are leaking.

Tons of fun, lol. Anyway, don't take shortcuts or you could get even more fuel in the cylinders and that = very frustrating. And make sure you disconnect the battery before doing anything.

[dattodude]

Two of you fellas have mentioned o-rings. How can this contribute to petrol in the cylinder? A busted o-ring might lead to petrol on the outside of the injectors or around the intake side of the engine, but not in the cylinder.

The Ohmmeter test is interesting. I know the manual says to check the resitance. But it is a go/nogo kind of test. This fellas engine runs ok, so all will pass that test.

He needs to take the car to a mechanic, or needs to get creative with some spanners and pull back the fuel rail and remove the injectors.

Put them in a ziplock plastic bag and take them to an injector specialist or workshop that can clean the injectors. Some injector places can't do SR20 injectors, but all will do CA18 topfeed ones.

Some leaky injectors can't be fixed, and will need replacing. Sometimes a good ultrasonic clean will fix them up. Most injector places will then flow test and spray test them.

Cheers,Chris

[capowered240]

Alright, what if the ohms read less than 3? When I ohmed the injector plugs, it was 2.7 on all plugs.

[AeonTorpor]

Was it like that on all 4? And do you have gas on the top of all 4 cylinders? BTW how does the engine run?

I'm guessing that 2.7 should be ok. When one of my injectors went bad it was reading 24 ohms. Mine read 5 ohms now.

edit: didn't realize the top feed thing... yeah, if injectors are reading ok and its top feed, and you still have gas on top of the cyls, that means they are leaking. Sorry bro, forgot about that. /edit

[capowered240]

Ya, all four injectors read when I ohmed them out read 2.7 ohms. Also all four cylinders have gas on them. The engine runs ok. When I give it gas it backfires alittle.

[c-rad]

2.7 Ohms is good. That's exactly what mine read. (even though they are DSM 450cc injectors)

[AeonTorpor]

Yeah man, it sounds as if they're leaky, but that's doubtfull on all 4. But the only other explanation i could think of would be running super super rich.

[capowered240]

I'll probably swap those out for these other ones I got along time ago. Their the same 370cc injectors.

[dattodude]

unoiled injectors can stop firing after just a week or two if not kept clean and dry.

This is why when you buy injectors they come with sealed caps on either end.

Give your old ones a try though. But the job of pulling out injectors is a pain in the ***, and I'd probably get them cleaned and flow tested before putting them in, unless they are brand new.

Chris

[capowered240]

I've got another quick question. Alright, I have a blitz bov. When I give it gas and hold it, the valve inside closes, but then when I hold it for awhile, the bov wants to open alittle bit just enough so air is let out. Then when I let off the throttle, it fully opens, but then right before the car sounds like it wants to die, it closes. Any ideas would help. Thanks