Why Is My '97 R33 Gts-T Running Badly?

[davinjones]

Hi guys,

First off let me say, i really dont know much about engines, parts, etc. I just love skylines, so forgive my lack of education from here on in...

I have had a problem going on for months now that still is not fixed, and am hoping someone could offer some suggestions.

Basically it is running badly, but not all the time. Sometimes its far worse than other times. And then other times it seems completely fine.

When i squeeze the accelerator gently (like you would for normal everyday driving), it feels jerky, not at all smooth like it always used to be. And at its worse even feels like the car is pulling back. If i accelerate harder it doesnt really seem to be a problem. I notice the problem most when im driving up hill around 55-60km/h in 3rd gear.

Also when I pull up at lights for a while, sometimes it starts idling really badly, goes down and up progressively worse, and if i dont give it a little gas, it will stall. I *think* this seems to be worse if i have the air con on, but im not sure if this is co-incidence or not.

It starts up without a problem, but i notice, if i try to move off too soon, sometimes it pulls back (sorta feels like a fuel problem). Not too worried about this, as if i start it up and wait a few seconds before moving off its fine. I just mention as its another symptom that didn't used to happen, and i suspect is related.

I have had the fuel pump replaced maybe 2 years ago now. And recently had the fuel regulator (im pretty sure thats what it was) replaced when i had it serviced, as the mechanic suspected it was the problem. Although the car improved a lot, and it wasnt nearly as bad as it was, the problem still happens. Could have been to do with the rest of their servicing. Spark plugs have been replaced regularly, as with any other normal maintenance that goes with services.

I found another thread where someone was complaining of similar issues, and some other suggested it was the Air Flow meter. Is that a possibility for my symptoms?

Any help & advice i can pass on to the mechanic would be GREATLY appreciated.

Or any places around melbourne (pref eastern suburbs) that people can suggest who deal with imports / skylines who might have a better idea would also appreciated.

Thanks

[Hadouken]

What mods do you have?

It sounds like a few problems.

Clean your AAC valve

Clean your AFM

Replace your air filter

Check your plugs

Replace fuel filter

Thats what I would do

[davinjones]

Thanks Hadouken.

It's all standard, no mods at all.

[Plattsy]

What mods do you have?

It sounds like a few problems.

Clean your AAC valve

Clean your AFM

Replace your air filter

Check your plugs

Replace fuel filter

Thats what I would do

+1

auto or manual?

[davinjones]

Thanks Plattsy - it's a manual.

[Plattsy]

right, only asked because i had a few engine stalling etc problems when me auto gearbox oil was low.

mate im down in hastings at my old felas this weekend, working on mine. if you wanna pop down in it ill hook it up to a diagnostic, so we can check your tps aac timing 02 sensors and all that jazz. just bung me a few jimmys!

[davinjones]

Geez thanks plattsy, that's mighty generous of you. I have the car booked in Friday for something else, so was going to get them to check out the above suggestions then. So I'll know by Friday night if it's still got problems or not. Saturday is a no go, but possibly Sunday if that suited you?

[Plattsy]

ill be working on the motor Saturday and Sunday, the consult check should only take about 15-30 mins, and dont get them to look at those problems mate, save your self some money. ill talk you through how to do it all its really simple! (no im not a Nissan mechanic but ive been inside more engines than there are mcdonalds in Australia so i should be able to help you out a fair bit!)

[Hadouken]

Definitely look up the diy's for all that stuff. Youll save yourself some coin and learn your car

[davinjones]

ill be working on the motor Saturday and Sunday, the consult check should only take about 15-30 mins, and dont get them to look at those problems mate, save your self some money. ill talk you through how to do it all its really simple! (no im not a Nissan mechanic but ive been inside more engines than there are mcdonalds in Australia so i should be able to help you out a fair bit!)

Thanks, appreciate that. They said that they have already cleaned the AAC valve previously thinking that was the cause of the idling problem too, but it doesnt appeared to have fixed it. He said they are a bit stumped over the cause of that.

The jerky acceleration problem, he seems to think it could be the coils causing the problem, but said they are pretty expensive to replace.

I'll see what they say when i pick it up tonight, but if no luck i might take you up on your offer Plattsy. Saturday might actually work for me after all.

[Plattsy]

pm buddy!