Idle issues

[xyster]

I'm having some idle problems with my CA. It started doing this about 2 days ago, a day after I installed a SAFCII...not sure if it's related or not. Before that, it idled rock solid at 850 when warm. Periodically, when I'm sitting at a stoplight or something, and the car is idling, the idle will drop to about 650 or so, and the car will shudder. Eventually the idle will creep back up to 850ish, but it'll still be shuddering, and only pulling 13 inHG or so, when it normally pulls 18-20 at idle. Aside from that, it drives great. It boosts fne, doesn't stutter while driving, ecu is throwing code 55. Knock sensor is connected. It seems like there might be a vac leak, but I can't find one. I just recently took apart and cleaned the whole iacv setup on the side of the manifold, and it ran fine. Timing was recently set at 15btdc...I guess I should check it again. Any ideas?Today, I'm going to replace the 3 vac lines, check the timing, and disassemble that iacv setup again.

greddy vspl fmicstock turbo @ 10psistock mafsafcII set to maf 7/ecu 7, and initialized per that engrish manualNGK plugs w/ less than 2k miles on themgood oil pressure: 20psi at idle, 60psi at 3k

[xyster]

well, as I was working on it today, I noticed a loud hissing coming from either the 2nd or third injector when I turn the key to ON, and the fuel pump primes. I've never heard this before. Is this normal and I've just never noticed it, or do I have a leaky o-ring or something? I don't smell gas in the engine bay.

[xyster]

Just did a compression test:

165165145150

According to the fsm, that's within spec, but just barely. I did it while the engine was hot, and I repeated it twice, just to be sure.

[cortina-mk1]

do a leak down test that will indicate the problem areaEG: ring seal or valve seat/headgasket

[xyster]

do you think the low compression in #3 is causing the idle problem?

[nab911]

Those compressions results look like a possible failing headgasket... dont quote me but its a guess. Usually if its blown then they will be really low...

[xyster]

so the hissing injector is normal?

[Altiman94]

not a hiss, but most injectors make a clicking sound that you can hear them opening and closing. I would takea venture that it may be your injectors, as my car shutters slightly at idle as well and its due to the injectors

[xyster]

after some extensive searching in the online mechanic forums, I think the leaking injector is causing the problem. What o-rings fit?

[XtremeHKS]

after some extensive searching in the online mechanic forums, I think the leaking injector is causing the problem. What o-rings fit?

Are they stock never been touched or cleaned injectors?

If so get them serviced you'll find some interesting results on 14-15 year old injectrs

[xyster]

what o-rings fit? ca18de, off a pulsar?

[Nismo1182]

My CA had that idle problem. I had a KA S14 MAF on it also. It would drop down really low then pick back up again. After a few weeks it stopped doing it.

Also, is the fuel injector hissing constant or just when the fuel pump is priming up pressure?

[xyster]

it's only hissing when it's priming up pressure, and I can only hear at the 2nd or 3rd injector. After semi-hard driving, I can smell fuel now, and I've never smelled it before. I had a friend ride with me, just to make sure I wasn't imagining things, and he smelled it too.

edit: If anyone knows what injector o-rings to use, I REALLY, REALLY need to know. My reserve unit's been activated, and I go on active duty this friday. I'm gonna have to drive 100+ miles a day to and from the base for the next 3-4 weeks, and I need this car to be running smooth. Thanks

[biosehnsucht]

just to be paranoid check all your fuel hoses for cracks also.

I used some crap fuel hose thats not meant for EFI w/o realizing it and it cracked.. just barely.. I only smelled the fuel when I used the AC, which was usually only when it rained and Iran the defrost to keep the window from fogging.. finally one day (in the rain) my friend and I after having BOTH noticed it and there being no other cars around to blame it on, checked under the hood and found that the last fuel hose leading to the fuel rail had cracked just enough to leak and the fuel was running down the fuel rail and dripping under the #3 and #4 injectors..

likely it is your orings or such since you hear a noise FROM the injectors, but be paranoid I say

[xyster]

I appreciate all the input, but I really need to know what o-rings fit these injectors. Will a kit from a ca18de pulsar work?

[boost_boy]

O-rings from the CA18DE will fit. If your O-rings are leaking you will have an idle problem.

Dee

[xyster]

Thank you...ordered them shipped overnight. I'll put them on in the morning and see how they do.

[boost_boy]

http://www.nissaninfiniticlub....70475

Quote »I posted this just for you! And now that I see where you are hearing the hissing noise from, it could very well be the seal for the butterfly valves. I hated it when it happened to me and there was no immediate fix, but to change it.[/quote]

Dee

[xyster]

update.

After changing injector o-rings, resetting timing, checking every sensor, adjusting the idle several times, rewiring my s-afc, changing the oil, disassembling/reassembling the fmic piping, checking all the turbo to manifold bolts, replacing all the vac lines, replacing the coolant temp sensor, checking the butterfly vlave seal, and replacing the pcv hose....the idle is slightly improved. When I changed the o-rings, I moved injectors 2 and 3 to cylinders 1 and 4. The hissing I heard from injector 2/3 during fuel pressure piming is now clearly coming from injector 4, so I guess that injector is leaking. It's driveable, at least for the next few weeks, and after that it doesn't matter.

I think my turbo is going now, though, because my fmic piping is damn oily, and the turbo is starting to smell after hard driving...I can't quite place the odor; my girlfriend says it smells like fireworks. Burning oil, maybe? I'm going to set it back at stock boost, for now. Any opinions on the ssautochrome t3 topmount manifolds that are on ebay now?

[boost_boy]

Quote »Any opinions on the ssautochrome t3 topmount manifolds that are on ebay now?[/quote] Just may work, but you are limited to a Tial or turbonetics deltagate wastegate.

Dee

[float_6969]

if your pcv system is hooked up oil in the turbo piping could be bad rings. Check the suction side of the turbo. If there is oil in there, it's your rings. If it's just the pressure side, then it's the turbo.

[xyster]

well, I'm pretty sure the rings are getting bad. Today, I was driving home on the highway, and when I got off my exit, I noticed the car was smoking from the engine bay. When I got home about 2 mins later, I popped the hood, and found oil sprayed everywhere. The valve cover, timing cover, intake manifold, and basically the entire passenger side of the engine were covered in oil. The little hollows between intake manifold runners had pools of oil about 3/4" deep. Apparently, the hose connecting to the breather pipe on the back passenger side of the valve cover (the one that angles down) had blown off. No big deal, except that I had only driven for about 15 mins, with the turbo set to stock boost, without even revving over about 4500. Correct me if I'm wrong, but I don't think it should have blown nearly that much oil. I was planning to take it down and rebuild it when I got back from this deployment anyways...I guess I'll just do it sooner now.

[boost_boy]

Yeah man, rings sounds abit worn to me. these motors do spit-up some oil, but not at stock boost. I used to spit up a bit a bit of oil over the engine bay, but we're talking 20psi of boost and over 140mph sessions. Just change the rings and rod bearings and your motor will be just fine.

Dee

[minutericesentra]

I think it would worth while to check your PCV system out before jumping straight to more expensive and complicated things, bad PCV valves can make you burn alot of oil depending on what position they get stuck in, if not that then you build up pressure in the crankcase and breather hoses and other craps starts leaking oil all over the place, dipstick sometimes even pops out while driving throwing oil everywhere.

[xyster]

pcv valve is not even a month old, the hose is not even 2 days old, and I checked them both yesterday.

The bearings are new. I replaced all the bearings when i rebuilt the motor back in october. I was kinda pressed for time though, so I didn't change the rings. It was originally an auto motor, and the rings looked like they were in good shape, so I left them alone. Believe me, I'm kicking myself for not changing them then. Unfortunately, I go on active duty tomorrow, and to Iraq within a couple months, so there's no time to change the rings. Looks like the 240 is getting parked under a car cover for the next year or so.

[float_6969]

You've got my sympathy. I haven't driven my car in over a month. It's in peices cuz I'm replacing the rings. Then I decided since I was in there, I'm just going to replace all the bearings, oil pump, excetera....Let us know how it goes man...

[xyster]

well, after tomorrow it'll be parked under a car cover, with the insurance cancelled, the battery disconnected, and the ignitor chip inside the house. In other words, it's down for a long time. In the meantime, I'll be enjoying the '00 Frontier XE Desert Runner I picked up today...heh