Jump to content
SAU Community

Recommended Posts

Hi there Guys,

It's been a while since i have posted a question and i have done some searching through the forums but i can't seem to find what i'm looking for.

Problem -

1995 Series 1.5 Skyline RB25DET

* Issues started with low idle - and engine stalling when cold (By the way it's an automatic) Engine would stall if any load was put on it.

* Investigated timing and all timing marks line up for 15Deg

* I've had fun by doing the following - re-Gapped sparkplugs; Got a 2nd hand CAS; Got a 2nd hand AFM; Brought new plugs

I've just been playing with the car today and managed to get it firing by itself but i had to hold my hand over the AFM to restrict the flow Engine was able to idle for 3-5secs before stalling again - I repeated the process and when firing took my hand off and died -

I'm thinking in my mind the following -=-

Either I have a break in the pipe work (Intake) but when i had my hand over the AFM the pipe was sucking in and i couldn't hear any other air. Or the AFM is cactus.

Does anyone have any other thoughts -

Regards,

Ashley Neal.

Link to comment
https://www.sau.com.au/forums/topic/324689-r33-rb25det-15-dramas/
Share on other sites

Check trouble codes then

check fuel pressure

The ECU did show me Code 55 - Everything OK -

The Fuel Pump is working - I disconnected the Feeder pipe and put into a bottle plenty of fuel went into the bottle - Is there a spec on how much presure should be there?

whats it like when its warm?

is it on a stock ecu?

if its always idling very low and is on a stock ecu, perhaps try to adjust the idle up a touch. theres also a mixture screw on the back of the ecu that you could fatten up a touch, that makes them run a little easier when their cold. But if you add fuel on base idle you will also want to up the idle screw.

GL

whats it like when its warm?

is it on a stock ecu?

if its always idling very low and is on a stock ecu, perhaps try to adjust the idle up a touch. theres also a mixture screw on the back of the ecu that you could fatten up a touch, that makes them run a little easier when their cold. But if you add fuel on base idle you will also want to up the idle screw.

GL

Hi mate,

The car seems to be racing when warm - sitting just shy of 1000rpm - when spec say's 650+/- has a slight sputter every now and again.

The ECU is a completely sealed unit with no trimpod for adjustment. I also checked for Dry-Solder in the AFM - and everything checks out there = ECU still giving Codee 55 = All Ok.

Edited by Nissan Maaaart
id go for fuel pump.

They can throw up an array of symptoms but seem ok with prelim testing like you did.

Otherwise vacuum leak...

Thanks mate, I've checked all the Intake piping and there is no apparent air leaks - does anyone know what type of presure should be coming from the rail --

I also did some further testing and with doing the following - blocking the Intake - and allowing a small vaccum of air into the AFM - the car would start with timing retarded - engine would fire on it's own for a moment - but if i removed my hand or made the vaccum less the engine would stall --

The suction from cranking felt quiet faint - can anyone comment on this?

Thanks.

did you look at all the piping cooler etc? my freind had a problem with his for 3 weeks before finding a pin hole in the intercooler.

try changing the fuel filter as well my turbo pulsar wouldnt run and idle and it was a blocked fuel filter but it still primed etc

+1 for fuel filter...im assuming you've checked your air filter..

My mates car wasnt starting, and racing at idle, i blew out the air filter with a compressor and it ran great for another couple of days..cheap prick wouldnt spend 20$ on a new one

Righto - Still Not anywhere -

I've replaced - all clamps, enusres tight- checked Cooler for leaks - new fuel filter -

And still no go - does anyone know how much New AFM's are and where to get them -- as I got a price from a crowd and it seemed a little steep at 780$ex out of Melb.

Or does anyone on the Northside of Bris have a 3 pin (Pink Lable) AFM that is known good that i could try?

Thanks.

Try a diffrent AFM had a simular problem on a mates car, Go to a wreckers or something and you might be able to test it, also AAC valve is clean? check that as well. Do you also have a BOV? or is it stock standard?

Edited by geraus

just unplug the AFM and see if it idles

the engine will run with no AFM and should idle OK, but it wont drive very well and will rev cap at 2500RPM

if the AFM is the culprit when you unplug it, it should run to normal idle

if the AFM is NOT the culprit when you unplug it, the same problem will be present and it will stall

just unplug the AFM and see if it idles

the engine will run with no AFM and should idle OK, but it wont drive very well and will rev cap at 2500RPM

if the AFM is the culprit when you unplug it, it should run to normal idle

if the AFM is NOT the culprit when you unplug it, the same problem will be present and it will stall

Hi buddy,

The vehicle wont even start - or run enough to test this theory.

I'll try the fuel line thing shortly.

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

    • Surely somebody has one in VIC. Have you asked at any shops?  Is this the yearly inspection or did you get a canary?
    • This is where I share pain with you, @Duncan. The move to change so many cooling system pieces to plastic is a killer! Plastic end tanks and a few plastic hose flanges on my car's fail after so little time.  Curious about the need for a bigger rad, is that just for long sessions in the summer or because the car generally needs more cooling?
    • So, that is it! It is a pretty expensive process with the ATF costing 50-100 per 5 litres, and a mechanic will probably charge plenty because they don't want to do it. Still, considering how dirty my fluid was at 120,000klm I think it would be worth doing more like every 80,000 to keep the trans happy, they are very expensive to replace. The job is not that hard if you have the specialist tools so you can save a bit of money and do it yourself!
    • OK, onto filling. So I don't really have any pics, but will describe the process as best I can. The USDM workshop manual also covers it from TM-285 onwards. First, make sure the drain plug (17mm) is snug. Not too tight yet because it is coming off again. Note it does have a copper washer that you could replace or anneal (heat up with a blow torch) to seal nicely. Remove the fill plug, which has an inhex (I think it was 6mm but didn't check). Then, screw in the fill fitting, making sure it has a suitable o-ring (mine came without but I think it is meant to be supplied). It is important that you only screw it in hand tight. I didn't get a good pic of it, but the fill plug leads to a tube about 70mm long inside the transmission. This sets the factory level for fluid in the trans (above the join line for the pan!) and will take about 3l to fill. You then need to connect your fluid pump to the fitting via a hose, and pump in whatever amount of fluid you removed (maybe 3 litres, in my case 7 litres). If you put in more than 3l, it will spill out when you remove the fitting, so do quickly and with a drain pan underneath. Once you have pumped in the required amount of clean ATF, you start the engine and run it for 3 minutes to let the fluid circulate. Don't run it longer and if possible check the fluid temp is under 40oC (Ecutek shows Auto Trans Fluid temp now, or you could use an infrared temp gun on the bottom of the pan). The manual stresses the bit about fluid temperature because it expands when hot an might result in an underfil. So from here, the factory manual says to do the "spill and fill" again, and I did. That is, put an oil pan under the drain plug and undo it with a 17mm spanner, then watch your expensive fluid fall back out again, you should get about 3 litres.  Then, put the drain plug back in, pump 3 litres back in through the fill plug with the fitting and pump, disconnect the fill fitting and replace the fill plug, start the car and run for another 3 minutes (making sure the temp is still under 40oC). The manual then asks for a 3rd "spill and fill" just like above. I also did that and so had put 13l in by now.  This time they want you to keep the engine running and run the transmission through R and D (I hope the wheels are still off the ground!) for a while, and allow the trans temp to get to 40oC, then engine off. Finally, back under the car and undo the fill plug to let the overfill drain out; it will stop running when fluid is at the top of the levelling tube. According to the factory, that is job done! Post that, I reconnected the fill fitting and pumped in an extra 0.5l. AMS says 1.5l overfill is safe, but I started with less to see how it goes, I will add another 1.0 litres later if I'm still not happy with the hot shifts.
    • OK, so regardless of whether you did Step 1 - Spill Step 2 - Trans pan removal Step 3 - TCM removal we are on to the clean and refill. First, have a good look at the oil pan. While you might see dirty oil and some carbony build up (I did), what you don't want to see is any metal particles on the magnets, or sparkles in the oil (thankfully not). Give it all a good clean, particularly the magnets, and put the new gasket on if you have one (or, just cross your fingers) Replacement of the Valve body (if you removed it) is the "reverse of assembly". Thread the electrical socket back up through the trans case, hold the valve body up and put in the bolts you removed, with the correct lengths in the correct locations Torque for the bolts in 8Nm only so I hope you have that torque wrench handy (it feels really loose). Plug the output speed sensor back in and clip the wiring into the 2 clips, replace the spring clip on the TCM socket and plug it back into the car loom. For the pan, the workshop manual states the following order: Again, the torque is 8Nm only.
×
×
  • Create New...