Urgent Help Required :/

[Jay88]

Hi Guys,

Firstly, I apologise for acting so desperate, honestly I am... I have loved Skylines my whole life, saved up a long time to buy a non turbo R24 25GT on my P plates...

I will stop boring you guys and get to the problem: (I am sorry in advance if I have posted in the wrong area also)

Problem:

MOST of the times I slow down (while braking), or coming to a stop, the REVS in my car bounce, and the engine tries to stay alive, it fails, and the car stalls. I can restart the car in one go which is followed by BLACK smoke (which I guess is indicating excess fuel burning). This will only stay for a few seconds. When I take off, there is a bit of a uneven acceleration.

When I accelerate, no issue, just when I am braking or slowing down, revs bounce up and down, car stalls.

Mechanic Actions and Repairs:

The mechanic did the following (I did SELF research and understood he did as much as he could)

1. Repaired Vacum Leaks

2. Cleaned Throttle Body

3. Replaced Choke

4. Adjusted Throttle Sensor

5. ECU scan = No Errors

7. Fuel Pump checked fine

8. Fuel pressure at idle and running is fine

9. Fuel Filter cleaned (SENSORS READ FINE, BUT SOMEONE SUGGESTED THIS MIGHT BE THE ISSUE and needs replacement)

10. Air Mass Filter cleaned

For 3 days it was fine, and again the car started to act up as I was driving around on the 4th day. Mechanic again had a look, adjusted the throttle sensor a bit and everyone is clueless.

I am a student...and I work full time.... without a car, I need to take unpaid hours off to attend classes... I would be extremely grateful if someone can point me in the right direction. I did all self research and now just lost and frustrated.

Thank you in advance.

Edited August 12, 2013 by Jay88

[MBS206]

What air filter do you run?

Is it an oil coated air filter?

If it is, replace with a normal paper style one, and clean the AFM again with CO Contact Cleaner.

[Jay88]

Hi mate,

Firstly thank you for your reply. Appreciate it very much. I am not much of a mechanic and not sure what the air filter I use is. However, i remember once a mechanic banged the air filter with his hands (the mass air filter in the engine) and the car kinda started smooth. But the sensors read no errors.

[niZmO_Man]

Not much help, but it might point you in the right direction.

Okay, I saw a couple of things that doesn't sound right.

3. Replaced Choke - Your car doesn't have a carburettor, so there is no "choke". What you would look at in regards to this is the coolant temp sensor (two pin plug near the thermostat housing, yellow I think). Not really relevant to your issue though.

4. Adjusted Throttle Sensor - You usually don't need to do this. Is your car automatic?

9. Fuel Filter cleaned (SENSORS READ FINE, BUT SOMEONE SUGGESTED THIS MIGHT BE THE ISSUE and needs replacement) - You don't clean the fuel filter, you replace it with a new one. I forgot the exact price, but I think they go for about $25.

10. Air Mass Filter cleaned - I'm guessing this is the air filter? Throw it in the bin and replace with a new one. Paper air filter (Ryco A360) go for $10-15 dollars.

I can think of two things:

1. AFM - the air flow meter (on the air box) is playing up (clean with contact cleaner as mentioned). Might need solder fix (search in the how-to section), or replacement with a known working one.

2. IAC or AAC - auxillary air or idle air control valves on the intake plenum. Usually you take them out carefully and clean them up. I think they is a guide in the how-to section.

Does it run fine when it's cold?

[ZRBE]

Maybe the BOV. Maybe not but I had this problem with my car.

Everyone so far has said it's most likely the blow off valve venting too much air to atmosphere.

[Kinkstaah]

That is true, but this car is a non turbo so it won't have a BOV

[StevenCJR31]

^^ the turbo versions dont have (factory) BOVs anyway

[mungy]

^^ the turbo versions dont have (factory) BOVs anyway

um what?.....yes they do......lol

[ZRBE]

^^ the turbo versions dont have (factory) BOVs anyway

The turbo versions DO have factory BOV's?

I bought a factory rb20det BOV.

Sorry didn't even see it was an N/A..

[StevenCJR31]

^^ no you didnt buy one. .the factory RB20 DET has a gas RECIRCULATION valve on it

Edited August 13, 2013 by StevenCJR31

[mungy]

^^ no you didnt buy one. .the factory RB20 DET has a RECIRCULATION valve on it

Are you hi? the R32, R33 AND R34 all have recirculation BLOW OFF VALVES.........

[StevenCJR31]

no, not high

you maybe tho for calling it a bov

[mungy]

no, not high

you maybe tho for calling it a bov

Thats because it is a bov? Blow Off Valve????????

And yes it is a recirculation type?????????

as the other type is called atmospheric

[StevenCJR31]

not what the factory calls them

please add more question marks as you arent getting your point across

[ZRBE]

not what the factory calls them

please add more question marks as you arent getting your point across

You sir, are a tripper.. Recirculating or not.. It is still a Blow Off Valve.

[StevenCJR31]

well no, its not a blow off valve otherwise it would be called that, youd know if i was a tripper or not as

i did buy the drugs off you

[iseekool]

Check your brake booster, could be stuffed causing a vacum leak when braking - therefore stalling.

Should NOT have had to adjust the throttle sensor IMHO - that's just masking the actual issue.

Change mechanic quick smart - to be quite honest his troubleshooting methology seems bit dodge.

[StevenCJR31]

you say the car blows black smoke when you get it running again, could the plugs be fouled from unburnt fuel? i know its a different engine (RB30E) but i had the same sort of issues you have, i got it sorted but i needed to change spark plugs to getting it running sweet again