Running on 2 cylinders need help

Post by **Structure240sx** » Sat Feb 28, 2004 9:32 am

I got my rebuilt turbo in yesterday from cheapturbo.com and it looks beautiful better than it did new $340 with a new compressor wheel.

Got it on yesterday and it was idling really rough and missing. messed with it more today to figure out cylinders 2 and 3 arent running. theres plenty of fuel, grounded the plugs all are firing, replaced the rotor and cap even put my stock wires on. it runs and drive jsut not well and smokes from all the unburnt fuel. i did a compression check yesterday and it was 1750, 170, 165, 170. im gonna try putting in an extra used distributor i have lying around tomorrow. the only other thing my grandfather and i can think of is if a small peice on the compressor fan blade came off and hit the pistons but it would have to go all the way through the intercooler and piping. even then the fuel still should be burning. any ideas?

Post by **C-Kwik** » Sat Feb 28, 2004 9:32 am

how did you determine cylinders 2 & 3 aren't running? Did you do anything else other than replace the turbo since it was last running correctly? Perhaps there is too much fuel? but usually this affects all the cylinders.

Post by **erich** » Sat Feb 28, 2004 9:32 am

Did you swap the plug wires on the cap on cylinders 2 & 3?

Post by **S14tat** » Sat Feb 28, 2004 9:32 am

same thing happend to me recently. when you unhooked the spark plug from the dead cylinders the engine acted the same. anyways the two problems are spark and fuel. since you already changed everything in the spark, i suggest you try lookin into the fuel system. swapping out the injectors from 2&3 with 1 & 4. the same thing happend to me but only on #3 and i swap it with 2 and 3. and that singled out the problem if the problems shifted to the new cylinders thats your problem right there. i was lucky that after i swaped the injectors, the car started working again. this was probrably because i put injector cleaner in my car before and there probrably a large piece of dirt keeping injector number 3 stuck open. once the injector got knocked around ( by removing and swaping) the dirt must've came out and the car worked. well anyways good luck to you.

Post by **Structure240sx** » Sat Feb 28, 2004 9:32 am

exactly what s14tat siad i pulled the plug wires out and the car acted the same when i pulled out 2 & 3. ill try swapping the injectors around tomorrow, wont take long. if its the injectors being stuck open (which did cross my mind for a second) what can i do if moving them around doenst change anything? well one problem that i jsut thouth of it that when i first started the car with the new injectors and ecu and maf it idled perfect. then i added too much oil causeing the turbo to blow (oil backed up in return line). since then the only thing i did was put in the new turbo and get my oil level right. but it idles now jsut like it did the day the turbo went as soon as i turned on the car.

Post by **S14tat** » Sat Feb 28, 2004 9:32 am

maybe there was oil deposites at the tip of the injectors. ( very unlikely ) but i mean using logic the only things that would cause just 2 cylinders to be dead was either spark or fuel. since spark is now ruled out of hte equation. just swap 2&3 with 1&4. thats the only way i can tell you. i mean you did buy used injectors right? i mean they do go bad sometimes and get stuck. if the problem moves from 2&3 to 1&4 then the injectors are definitly the problem. well good luck to you man.

Post by **Altiman94** » Sat Feb 28, 2004 9:32 am

if ther is a problem, get all new ones. Then you have no worries.

Post by **C-Kwik** » Sat Feb 28, 2004 9:32 am

Just to confirm, you are saying your car had this problem around the time you blew your first turbo right? It may have just been coincidental that your turbo blew at the same time whatever the cause of your dead cylinder problem started. Maybe the O-rings on the injectors are bad? If they were, they would be dumping fuel into those two cylinders. It's not hard to damage injecot O-rings when installing them. BTW? How did you test that the injectors were firing on those cylinders?

Post by **Structure240sx** » Sat Feb 28, 2004 9:32 am

the injectors were never used before but i bought them from a guy i met before instead of a store.

well #2 i pulled the plug and i could smell fuel and see it coming out when i was turning over the engine. i assumed #3 was the same since i pulled the spark plug wire and it was the same result as #2. i will be pulling them sooner or later today to check the o rings and possibly oil deposits. thinkin of it though no oil was coming out of the compressor im pretty sure when it blew. unless there was so much it was able to go through the exhuast manifold into the cylinder, not burn all up, and into the intake manifold. the #2,3 exhuast runners are about half as short as the other on the revhard mani.

Post by **C-Kwik** » Sat Feb 28, 2004 9:32 am

Did you use brand new o-rings? You should. Once they are exposed to fuel, they tend to become quite brittle. They should be replaced everytime the injectors are removed.

I doubt the oil would have gone backwards into the motor. And even if it did, it should not cause any damage to the motor itself.

Perhaps test the injectors for leaks. Disconnect the plugs to all the injectors. Pull all the spark plugs. Then crank it with the throttle open. If you see fuel coming out the spark plug holes, you have a leaky injector/o-ring. Make sure you crank it for a little while though to make sure that it's not fuel that is already trapped in the cylinders. Make sure the engine is cold when you do this. You don't want to expose the fuel to a heat source.

Post by **Structure240sx** » Sat Feb 28, 2004 9:32 am

well c-kwik was right once again abotu my problems. the small o-rings on the injectors were crushed/torn. problem now is that the little black plastic ring behind the small 0-ring on almost all the injectors is bent. this means the 0-ring doesnt have a flat "seat" so it kinda bends and doesnt seal too good as i torn more up driving around i guess from the fuel pressure under boost. all these plastic peices i have on my stock injectors so i can replace them except i cant get the capp on the tip of the injector off with out breaking it. where can i find jsut these caps? and are they absolutely neccessary? other thing is that the plugs are coming out very white/oxidized. this means im running lean which i dont under stand with 740cc/z32 maf/jwt ecu/slightly higher fuel pressure/and base timing set right to 20 degrees. if i can fix these injectors then ill wait to get a wideband on my car from my uncles shop. i jstu didnt really care too much today so i was beating on it until it started smoking again from all the fuel. compression is still good

Post by **C-Kwik** » Sat Feb 28, 2004 9:32 am

Couldn't tell you about the injectors. I've never taken one apart. As far as the white plugs, it may be that it's running lean. What heat range plug are you using and what boost level?

This is a good basic guide to plug problems:

http://www.pdm-racing.com/features/plugs.html

Post by **Structure240sx** » Sat Feb 28, 2004 9:32 am

yea thats what i went by. i am using 7 heat range (ngk bkr7es-11) right now and was hitting 8-9psi today. i know its kinda low but i was hoping to turn up the boost. should i put the 6 heat range back in? i read one of markemark's posts that said u cant get the injector cap from the dealer. im goin to go there tomorrow anyway and if not ill call rc engineering or someone else.

Post by **C-Kwik** » Sat Feb 28, 2004 9:32 am

You might try that and see if the plugs begin to look a little more normal.

RC engineering might be a good resource. They may not tell you what to do exactly, but they can probably tell you if it's servicable and then ask you to send them in for repair.

Post by **Structure240sx** » Sat Feb 28, 2004 9:32 am

i will try that tomorrow. i know i can repair them myslef. the way the cap is is that theres a littly edge that hold it in place. so once it slides over that its there and doesntbend out enough to get off it without breaking. so if i had new caps i can push them on after replacing the pastic peice behind the o-ring. thanks for your help c-kwik

Post by **C-Kwik** » Sat Feb 28, 2004 9:32 am

Glad to help.

Post by **Structure240sx** » Sat Feb 28, 2004 9:32 am

well the dealer really doesnt have the caps for the injectors. i called rc engineering who said they can put a generic cap on it and machine it to fit perfectly. best of all they are only $1.25 each! so i broke off the pintle caps and replaced the plastic seat thing i screwed up. i overnighted the injectors and RC said it will only take a day for them to get it done and hopefully they will ship it out the same day. if all goes right ill be running this weekend

Post by **C-Kwik** » Sat Feb 28, 2004 9:32 am

Hope it works out. Good luck.

Running on 2 cylinders need help

Running on 2 cylinders need help

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