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Idling Problems!

johnabs

By johnabs,
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johnabs Community Regular

johnabs

Posted
Posted

Hi all,

i turned on my R33 series 2 after 6 months in repairs after having an accident. I came to turn it over today and it turned and sounded like a rotary cutting off. I installed my FMIC (intercooler) rouughly, just enough to suck in air, added some oil and jumped started the car. The car has been off since 6 months, however about 4 months ago started it and it turned over. The car is cutting, sounds like a rotary cutting off. As the battery has been dead, maybe my powerfc computer has been reset, i dont know. the car idles very bad, i have no water in the radiator but not sure if thats the problem to why the car is making so much noise?

any suggestions to why the car is idling weird.

thanks

John

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johnabs Community Regular

johnabs

Posted
  • Author
Posted

Hi all,

i turned on my R33 series 2 after 6 months in repairs after having an accident. I came to turn it over today and it turned and sounded like a rotary cutting off. I installed my FMIC (intercooler) rouughly, just enough to suck in air, added some oil and jumped started the car. The car has been off since 6 months, however about 4 months ago started it and it turned over. The car is cutting, sounds like a rotary cutting off. As the battery has been dead, maybe my powerfc computer has been reset, i dont know. the car idles very bad, i have no water in the radiator but not sure if thats the problem to why the car is making so much noise?

any suggestions to why the car is idling weird.

thanks

John

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johnabs Community Regular

johnabs

Posted
  • Author
Posted

Hi all,

i turned on my R33 series 2 after 6 months in repairs after having an accident. I came to turn it over today and it turned and sounded like a rotary cutting off. I installed my FMIC (intercooler) rouughly, just enough to suck in air, added some oil and jumped started the car. The car has been off since 6 months, however about 4 months ago started it and it turned over. The car is cutting, sounds like a rotary cutting off. As the battery has been dead, maybe my powerfc computer has been reset, i dont know. the car idles very bad, i have no water in the radiator but not sure if thats the problem to why the car is making so much noise?

any suggestions to why the car is idling weird.

thanks

John

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Primordial Grand Master

Primordial

Posted
Posted
i cant seem to see the problem with the car, do u have a potential solution or are theses forums arguments and commenting on pointless unrelated issues.

eh?

Hi all,

i turned on my R33 series 2 after 6 months in repairs after having an accident. I came to turn it over today and it turned and sounded like a rotary cutting off. I installed my FMIC (intercooler) rouughly, just enough to suck in air, added some oil and jumped started the car. The car has been off since 6 months, however about 4 months ago started it and it turned over. The car is cutting, sounds like a rotary cutting off. As the battery has been dead, maybe my powerfc computer has been reset, i dont know. the car idles very bad, i have no water in the radiator but not sure if thats the problem to why the car is making so much noise?

any suggestions to why the car is idling weird.

thanks

John

Ok first question - What does "installed my intercooler roughly" mean? You either install it or you dont!?

Boost/vacuum leak = idling issues

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700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted
i cant seem to see the problem with the car, do u have a potential solution or are theses forums arguments and commenting on pointless unrelated issues.

John....after being in a work shop...panel beater..etc.

I do believe your filter,afm has alot of dust and need to be cleaned.

The other thing it could be is your spark plugs...these can rust up on the ends.

They may also need changing.

Also you could be correct in assuming the cpu has re-set itself.

I am sure ,while there has been no power, some-one could have pressed down on the brake for more than a few seconds.

But if this was the case your car would idle untill it went back to factory settings.

The only other thing could be is your fuel pump might have seized or is on the way out.

Get yourself a new battery and test your fuel pressure.

Clean your plugs,air filter and afm.

If this does not work...I am sure you have an air-leak from your fmic

Hope this is a logical explanation.

OH...Put some water in your radiator...lol

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r32gtrpowa Enthusiast

r32gtrpowa

Posted
Posted

Sorry to be a royal pain in the arse, however i am having the same problem with my daily driven 32 gtr, is there any way of checking for a vacuum or boost leak with out stripping everything bare? i have been putting up with this for the last couple of month's and i am sick to death of it! everything else you mentioned i have replaced but to no avail

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Primordial Grand Master

Primordial

Posted
Posted
John....after being in a work shop...panel beater..etc.

I do believe your filter,afm has alot of dust and need to be cleaned.

The other thing it could be is your spark plugs...these can rust up on the ends.

They may also need changing.

Also you could be correct in assuming the cpu has re-set itself.

I am sure ,while there has been no power, some-one could have pressed down on the brake for more than a few seconds.

But if this was the case your car would idle untill it went back to factory settings.

The only other thing could be is your fuel pump might have seized or is on the way out.

Get yourself a new battery and test your fuel pressure.

Clean your plugs,air filter and afm.

If this does not work...I am sure you have an air-leak from your fmic

Hope this is a logical explanation.

OH...Put some water in your radiator...lol

Agree with all of that although AFIAK the powerfc doesnt have volatile memory so if the battery is removed/disconnected for a long period the PFC shouldnt lose its tune..

And.. yeah coolant in the radiator is the first step!!

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Primordial Grand Master

Primordial

Posted
Posted
Sorry to be a royal pain in the arse, however i am having the same problem with my daily driven 32 gtr, is there any way of checking for a vacuum or boost leak with out stripping everything bare? i have been putting up with this for the last couple of month's and i am sick to death of it! everything else you mentioned i have replaced but to no avail

You can try cleaning out your AAC valve also. This has solved hunting and idle issues for other people in the past. You will find a DIY in the FAQ/DIY section (although it is for RB25DET it might not be too different).

Are you sure you've checked all lines and piping to the IC and vacuum system? Has the vacuum lines been removed and possibly replaced in the wrong spot or similar?

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700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted
Sorry to be a royal pain in the arse, however i am having the same problem with my daily driven 32 gtr, is there any way of checking for a vacuum or boost leak with out stripping everything bare? i have been putting up with this for the last couple of month's and i am sick to death of it! everything else you mentioned i have replaced but to no avail

Its more likely to be your afms rob...give them a knock when you have the engine running to see.

If so get them out and repair them...their is a DIY in here somewhere()

Where are you ASH..lol

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r32gtrpowa Enthusiast

r32gtrpowa

Posted
Posted

Have Removed both airflow meters, as of the sensational DIY section on SAU, have fully cleaned out with contact cleaner (pc circuit board use) and re-soldered the connections eh ....

I have no idea if it has vac hoses running where they shouldn't be, i know i havnt touched them, should i be checking for leaks on the Factory BOV piping perhaps?

I know one thing it runs bloody beautiful and then you will be idling at the light and ...... tears and embarrasment lol

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johnabs Community Regular

johnabs

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Posted

thanks for the help guys, but the idle is really loud and anooyin. like i put my intercooler on however didnt secure it casue my car just got out of an accident and didnt have my front bar ready yet. its a loud grunt and sounds like its chokin, not sure if engine was damaged in accident - though it phsyiccally seems fine but just hope that my bearing etc or somethin internally isnt affected and what sort of signs would this show??

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Poida Community Regular

Poida

Posted
Posted (edited)

maybe if some of these things you can't fix yourself and it becomes a little serious, it might be worth going to a real mechanic to have it checked out? Before the thing goes bang?... New engine vs taking it to the mechanic..? I know which one i'd be looking at if i couldn't solve it easily.

Edited by Poida
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Primordial Grand Master

Primordial

Posted
Posted

Have you even checked that there is oil in the engine and that it hasnt all leaked out or something?? If you havent got any coolant in the radiator I'd be checking this as well!

As per Poida's advice, getting a real mechanic to have a look at it would be the smartest option.

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  • 8 months later...
Jonnygtr24 Apprentice

Jonnygtr24

Posted
Posted

have found the best way to check for air leaks (vacuum leaks) is to squirt brakecleaner around any possible leakage areas. If there is a leak the idle will rise slightly. Start with the obvious things like pipework and rubber boots etc, try the split line on the bottom of the plenum chamber, Skylines are known to leak here, also check the intercooler for leaks and all pipework joints.

To adjust the idle speed with the idle speed screw on the back of the plenum chamber you have to disconnect the Fast Idle Control Valve and the Idle Speed Control Valve and also the tps (good practice to check this fisrtly for <0.55 volts at fully closed. You can then set the base idle to around 750 rpm. Re connect everything and the ECU should hold the idle at 800 rpm.

However the most likely cause of your problem is a blow off valve venting to atmosphere. This is because the ECU acceses the amount of air inducted and sets the injector duty cycle accordingly to maintain the correct air/fuel ratio. Once the BOV dumps this air the mixture becomes overly rich until the BOV closes and rpm etc equalise. My R33GTS25t did the same thing. Once I plumbed the BOV vent back to the turbo inlet (AKA stock) it was fine again.

Finally the reason the Super FC doesn't use a map sensor is because Skylines don't have one, they just rely on the Mass Airflow Meter. This is also a common cause of many "Skyline Probs":wave:

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