Jump to content
SAU Community

Hard To Start In The Mornings - Rough Idle For 10seconds

FULOCK

By FULOCK,
in General Maintenance

 Share

Recommended Posts

FULOCK Collaborator

FULOCK

Posted
Posted

Hi all,

this question is for my s13 silvia i have just bought as a daily for the next year or so (before a 25 will be dropped in there and turned into a monster!!)

Its a CA18DE - and I cant seem to even be allowed to reply to a thread in nissansilvia.com, and administrators won't answer my emails, so I thought i'd ask the trusworthy SAU forums!! :huh:

-------------------------------------

When I bought it, there was a little surface oil here and there in the engine bay, so I thought i'd give it a degrease.

now I was carefull to not get water in where its not supposed to be - but I was obviously not carefull enough - so then it wouldn't run for the next 40mins - understandable........

the issue is now.... every morning, the first time I start it up, it will missfire like hell for about 10sec or so, sometimes it will take me upto 3 attempts at kicking the engine over for it to start - then once it gets going its fine again and runs perfect, untill the engine completely coolz down (3hrs or more) and I need to start it again...... before I tried giving the engine bay a degrease it never used to do this - it used to start perfectly every time every morning!!

I've taken out the coil packs and spark plugs and gave them a good clean - there doesnt seem to be any moisture anywhere at all.....

have I possibly damaged a sensor or something??

Sorry for the essay and thanks in advance for any help!! :)

mad082 Grand Master

mad082

Posted
Posted

could be that when you washed it down the moisture has gotten in somewhere it shouldn't have and even though it may have dried out now it may have caused some damage to a coil pack or something like that.

may also be worth going round with a can of wd40 or something like that and spraying it into any electrical plug you can get to easily. also do a search on here of how to tape up the coil packs. that might be worth trying as well.

FULOCK Collaborator

FULOCK

Posted
  • Author
Posted
could be that when you washed it down the moisture has gotten in somewhere it shouldn't have and even though it may have dried out now it may have caused some damage to a coil pack or something like that.

may also be worth going round with a can of wd40 or something like that and spraying it into any electrical plug you can get to easily. also do a search on here of how to tape up the coil packs. that might be worth trying as well.

cheers for that i'll give it a go..... i've had a few people tell me to try reset the computer, just unplug the battery for a few hours.... something to do with the cold start or something?? maybe computer has itself all confused when the engine wouldn't start when I degreased it and since then has locked itself in some sort of wierd state?? dunno.......

car doesnt have an exhaust leak by the way, and new sparkplugs were put in just before I bought the car, approx 3000k's ago, and when I took them out to have a look, they seemed fine, not fouled, not dirty.... etc.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

AAC - Aux Air Control unit, give it a clean, it opens up when the motor is cold to achieve a high idle. Seems to be a common point of failure when it gets all dirty.

bert_ Rising Star

bert_

Posted
Posted
AAC - Aux Air Control unit, give it a clean, it opens up when the motor is cold to achieve a high idle. Seems to be a common point of failure when it gets all dirty.

not always the case though. it is a common problem. i had the same problem, was fairly hard to start in the morning. the idle would drop pretty low and id have to step on the accelerator a tad before it would jump up to about 2k rpm and then drop to 650. i cleaned the aac valve and it worked for a day or two then it started to happen again. i took the aac valve out to see if it were dirty but it was still fairly clean.

not sure what it is really.

ive tried unplugging the tps to reset idle, unpluged the ecu to reset every thing aswell but no luck.

but thats a good point, give the aac a clean and it might just work for you.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

Well the IAC controls idle and is situated on the side of the plenum (RB20/25s)

and the AAC valve sits in the middle of the plenum and feeds off that fat black hose off the cross over pipe.

Cleaning both of them did the trick for me in the past, and with my RB20 180SX the AAC valve was stuffed and the previous owner blocked it up with a bung, bought another one on this forum for $20 and sorted it straight up.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • silviaz
      Steps to DIY sanding car back ready for respray....

      By silviaz · Posted

      Yep will do, thanks for all the help.
    • itsforandres
      BCNR33 Blower Motor Resistor - Testing

      By itsforandres · Posted

      @dbm7 and @GTSBoy thank you both very much! will give that a shot!
    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Sounds good. Provided the panel is flat/level I'd be happy to start the painting process.  While you are learning, for sure you could do this. Its only paint, you can always sand it all back and start again. Its only your time and money on materials, but while you're learning, really its time and money spent on your education.  Once you know how to do this bodywork and painting, you won't want to waste your time and money on frivolous activities lol. 
    • silviaz
      Steps to DIY sanding car back ready for respray....

      By silviaz · Posted

      Yep I will use a guide coat after putting filler, I will do it on the whole panel as I'm a beginner so chances I've made quite a few errors. In that photo, I think that was a low spot, I just for example said to pretend it's flat but I will put filler + guide coat after to assess where I'm at. Yep with that picture, the panel is wet as it rained when I took the photo. But all those scratches are completely smooth, I went over it with 240 grit and can't feel it, even with my nail digging into it. I was legit thinking to buy a 2k can and spray primer to see how it turns out but then thought to myself it's going to be a mess doing it haha. Good mention there. Thanks for all that info I think I know what to do next.
    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Prior to laying down the primer, you need to make sure the surface is completely level. For example, based on this picture, I strongly suspect that the areas marked in blue are higher then the area marked in green.  If you spray primer over this entire area, then paint and clear it, the finished result will 100% show the low area. It will stick out like dogs balls. Unfortunately the paint won't magically level out the low areas as you lay it down.  Without seeing it in person, I expect that the green area will need to be filled, then use a guide coat and check that the entire repair area is level with a large sanding block.  With this picture, are you saying that even though you can see the scratches, the panel is in fact completely smooth and flat? If this is the case sure you could prep and paint it as it is.     The picture with the paint you described as blistering, it's hard for me to comment on from the photo alone. It looks like the panel is wet? Dunno, looks strange. Does the panel feel as smooth as glass when you run your hand over it? **** Going back to your question again, generally you would only sand the primer if you made a mistake while laying down the primer.  If the panel is prepped properly and you lay the primer down properly, you should not need to sand the primer.  This wouldn't work - Don't prep the panel. Spray primer and see how it turns out. Sand the areas where the issues appear. Spray more primer and see how it turns out. Sand the areas....... Yeah you'd go round and round in circles getting no where. 
×
×
  • Create New...