Jump to content
SAU Community

Recommended Posts

Hey guys

I don't post of here often, I look alot. I'm in need of some help but guys. My R33 had a problem a while ago where it would really badly missfire (even on idle) to the point where the car shook a bit. I services her (plugs, fluids etc) and it hung around. So I figured it must be the coilpacks. So I bought some R34 Gtr ones and they have a built in igniter so they pop in. Fixed it. She was running great! Strong smooth power. Then the other night, stomp my foot down, boost pressure builds and starts pumping, 4000-5000 revs the car stops. Not stalls, just like it paused for one second then kicked back in.

Did a bit more driving, decided to slowly feed the power on now to see at what rev range the pause kicked in. It was literally a pause. Thrown forward in my seat for a second then back on. It didn't do it. If I wind out the boost (feed it on slowly) she's fine. However, the issue now is. Since the pause, I've got alot of black smoke coming out the exhaust. It only seems to be on boost but. Not normal driving.

I'm thinking (and hoping) it's my AFM? As I'm hoping the turbo is fine. But the boost is still as smooth as it was at the moment even with the smoke.

Any ideas guys?!? I'm Uni student too so I'm praying it's not gonna cost me an arm and a leg

Thanks guy

Help me fix my girl :(

Turn down boost to 7psi see if it helps, or run 5 psi by running a boost line from actuator to boost pickup point

did you put the earth for the coilpack harness back on when you put it all back together?

Yeah. I replaced the coilpacks 2 months ago. Why I'm curious as to whats going on now though. I've also re bolted my battery earth as the bolt sheared off a while ago. So that's sweet too. No idea what's going on

+1 for winding the boost down. I'd put money on you actually running more than 9psi (despite what your gauge says). cleaning the Afm may help the situation, but the problem is that the ecu is seeing too much airflow for a given rpm and load. I used to have this happen to my 33 on cold mornings.

I'll give it a go boys. Only thing is she has been running 9pound now since about 3-4months ago. So I don't know why it would do this all of a sudden?

Cold air is more dense, so the ecu compensates.

As for running 9psi, as I said, your gauge may be reading 9psi, but you may be running more. Comes down to the brand of the gauge (some more accurate than others) and where you have it hooked up to.

I'd start by cleaning the afm, then if that does nothing, wind the boost down

Okay so update.

Took the car out last night. Just standard drive. She drove fine. Idle smooth. Power good. I didnt really go near boost though. Checked the ecu for fault codes with mr paper clip. Got a "55" which is "no malfunction"? Huh? This happened the other night and I haven't driven her that much since. So the fault code she still be there?

One more thing to add that I always forget about lol I had to replace the fuel pump on her as the spindles inside went (Christmas day just passed, so f***king great timing). Replaced it with a second hand R34 Gtr pump which has 15,000 genuine km's on it. Contributing factor? It did happen with just, just over a quarter of a tank and I know the fuel pumps on skylines don't like being run low. Possible cause or me being paranoid?

  • 2 weeks later...

Hey guys

Sorry I haven't updated in a while. I haven't had a chance to look at my car. Uni is in full swing. However over the last weekend i got around to changing the oil on her (she was overdue by a good amount, and have noticed a slight drop in oil pressure). So new oil and filter. Start her up. She runs smooth as anything. She was full on fuel so I decided to give her a spirted run to flush some new oil through the system.

So I'm driving along after about 15mins of standard driving, touch of boost here and there, feels good, I drop her back to second, balance the revs and plant it. Boost comes on strong and smooth as anything. No kickback just straight in.

Here's the thing though, I did this about 2-3 times and all of those times there was ZERO smoke and ZERO misfire. I also popped the car during this time and hooked up a boost gauge (as I'm running 9 psi and she's pretty much stock as a rock I haven't invested in one yet) and the boost was fine. Still 9 psi. It's a manual boost controller and it's +2 clicks/1psi so I figured it would still be okay. And the ecu is still reading "55" so all clear.

Any possibility that low/oldish oil could cause more fuel dumpage? Is there a sensor or something possibly at the back of the sump that tells the ecu (when using boost due to oil feed to the turbo while low, and the kickback from it) that there's not enough oil. Therefor cutting the power sometimes. Or requiring more fuel? 1st may add up the second I'm still skeptical about

Anyway sorry for the delays guys and thanks for all the help so far. Let me know if you think of anything :)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • 15000? ish? Something like that anyway. It wasn;t so much a wear as a tear that then spread. Might have lasted a lot longer if not bothered by just one incident, whatever it was. I took a punt. They are really comfortable and do a good job of holding. My daughter HATED it when I first put them in, and probably still does now. She has sensory issues and hates the way they are all up your business. I'm 197cm and 95kg. Not fat or particularly wide, and the XL size seat is the rigth fit. If I was any fatter it would start to get too snug. Any skinnier and you'd possibly want the smaller width.
    • Mrs rs focus came factory with recaro cs  sportsters in it and they a pain in the ass to get in and out of with the really high bolsters, once you were in them they were one of the most comfortable seats I have ever sat in
    • The NA 2.5 has very little torque. You won't feel much. Those trannies are also a million years old now and it could well be f**ked. First generation electronically controlled autos will often refuse to kick down, ete, etc, depending on what's wrong with them.
    • Yes, but no but yes but no. Those "it's fine up to 500HP" rules and everything else like it were all determined back when the cars were 10 years old. As they are now 30 years old.....what do you reckon the chances of something shitting the bed are? I'd say they are much higher now than they used to be. You might be lucky. You might be unlucky. Spin the wheel and find out. Yeah, nah. It's actually exactly the opposite. Making boost early and having heaps of torque able to be generated right in the middle of the rev range will do more to damage an engine than having to rev it high to make the power. Think about the load on the conrods, bearings, etc, to make 400HP at 4000 rpm, vs 400 HP at 6500 rpm. So someone has already "let the Nissan out" which is how we describe the increased chance of a fiddled with engine to have had something done wrongly. Many more engines that have been opened die than stock ones do - even if you into consideration how they are treated wrt power levels and the like. Again, not saying that yours will definitely have been put back together by a moron. But the possibility does exist. It's still a lottery. Spin the wheel. What weakspots?
    • Sell it and buy a turbo version will make it a lot faster 
×
×
  • Create New...