Car Choking While Cruising

[Kaz200]

Hey guys,

having an issue with my s15 (sr20det).. no idea where to start :\ similar issues seen with skylines so yeah..

Car is choking while cruising, feels like its going to stall eventually. Was fine all week until Thurs night and then got progressively worse.

Seems worse at 60km/hr or low speed than 80km/hr. If I thrash it, it seems ok..? Maybe?

Maybe a related issue that has been going on for a few weeks is when braking to red light, sometimes the revs drop to about 200, cpl of times it has actually stalled on the freeway in heavy traffic/freeway carpark.

Have looked at every hose (I think), cannot see a vacuum hose off anywhere..

I thought AFM for the choking issue but swapped it yesterday with a friends and no difference.

Plugs were done a few months ago, pulled them out, they seem ok, asked 2 ppl for advice they said they look ok as well..

What else to check?

Another friend said o2 sensor but I think my fuel economy would be shit if it was that.

No idea when the fuel filter was last done as I haven't had this car long, would that be an issue?

Im thinking ignition or fuel at this point but not sure..

Thanks for any help

Kaz

[Bsa]

How long since fuel filter was replaced dont worry just read it again change that could be a dying fuel pump. What are the mods

Edited April 8, 2012 by Bsa

[Kaz200]

not much in way of engine mods, just FMIC, GFB Bov, turboback zorst..

yeah thinking I will change fuel filter tomorrow. hopefully not fuel pump

otherwise I'm going Walbro LOL

[Bsa]

Properly a good idea as the stock one is getting old. Is the bov plumbed back? Could be opening up

[Kaz200]

its a GFB bov adjustable from atmo > plumbback

[W0rp3D]

You got the standard one to put back on? Worth a try.

[Kaz200]

hmm I do actually.. omg would be so sad if its the BOV I love the noise haha..

I'm a girl tho, I'm allowed!

[W0rp3D]

Lol, fast and furious girl!

[DVS JEZ]

Have a really good look at the front mount cooler piping, it may be a split silicone joiner or a pipe may have rubbed through near the battery tray etc.

Where are u located?

[Dobz]

The BOV piston could be a bit gunked up and sticking open a little. You could try just tightening the BOV right up and gioing for a quick drive.

[Kaz200]

hmm ok the only hoses i havent checked is the FMIC joiners at the bottom.. will check today

I'm in westside melb..

hmm ok well im going to Autobarn to get fuel filter soon...

Gawd at this point it has not been narrowed down, I'm only getting more suggestions lol.. thats helpful but not, at the same time lol

[Bsa]

I would try fuel filter first also check pump flow a mechanic shop should be able to do this one other thing could be the cat could be blocked. Might be worth putting it on the dyno and removing the exhaust and checking the rest

[mad082]

try a new fuel filter.

is there any kind of EGR (exhaust gas return) on the car? it may be that it needs to be cleaned out. i know that is a common issue with the natro sr20's.

also try unplugging the o2 sensor and seeing what that does.

finally, is the car auto or manual?

[Kaz200]

changed fuel filter today.. noticeable improvement in driving tonight but not sure if it's fixed it.. will test more tomorrow when going to work.. I suspect not tho it seemed to start faltering a little bit..

EGR.. nfi.

hmm cat blocked.. thats a possibility.. fuuuu so many things to check

need to borrow consult and see what it says.. tho from prev experience (180/r32) it usually has no faults lol, so may prove worthless..

[Kaz200]

oh tis manual btw

[Bsa]

It seems like fuel issues if the filter improved it I would also check the fuel pump sock could be full of stuff

[Kaz200]

fuel pump sock.. hmm think the sock monster might have it.. umm. wtf is the sock lol

[Bsa]

It's a filter on the bottom of the fuel pump basically a intank fuel filter they get covered in shit fuel tanks are not very clean places

[DVS JEZ]

Did u chec those silicone joiners? Make sure they are tight and have a good feel that they dont have any splits or holes.

Make sure the piping hasnt rubbed through where it goes through the battery tray

[KnightRiderR33]

did you clean the POD filter recently? i used a k&N recharge kit on mine once and applied to much oil which in turn stufed my MAF sensor give it a good clean with crc MAF cleaner and see how it goes i took it to 5 different mechanics wasted money on CAS coils Ignitor fuel pump then to find it was the MAF