120 1KZ rough start/idle

[allfie1968 Lurker Find all posts View Profile Close allfie1968]

Hi guys,

New to site and wondering if anyone has a solution to a problem I have with my 120 . cold starts are becoming a problem , not every time but engine starts rough and blows blue/white smoke for a few seconds then settles down to perfect idle , engine has plenty of power I have replaced glow plugs I do run two fuel filters as well . I recently took intercooler off and cleaned throttle body was a bit greasy ??? . vehicle has 160k with auto gearbox , went up the coast last Friday 500 k run never missed a beat ?? am hoping someone can help I am pretty handy with a spanner just want to explore my options before sending to a diesel mechanic

Cheers phil

[OldGreyFart Advanced Member Find all posts View Profile Close OldGreyFart]

Google is your friend - there is a multitude of posts on this issue and one STICKY. Use search.

[allfie1968 Lurker Find all posts View Profile Close allfie1968]

thanks for advice mate , have worn my fingers out looking online , thought maybe someone on here can steer me in the right direction ????

[SWR Banned Find all posts View Profile Close SWR]

Gday allfie1968

have worn my fingers out looking online , thought maybe someone on here can steer me in the right direction ????

No problemo!

Read this link below!

diesel rattle in D4D Prado

Cheers

[allfie1968 Lurker Find all posts View Profile Close allfie1968]

hello back skywalkerrun , mine is not d4d but I did check out the link , im guessing a new set of injectors could be a start .

[macaroon1 Advanced Member Find all posts View Profile Close macaroon1]

Google is your friend -. Use search.

This took a few seconds, maybe it's of some help: http://www.4wdaction.com.au/forum/vi...?f=54&t=144524

FWIW my MAP sensor was thoroughly cleaned along with the throttle body and it did make a huge difference. 10+ years of EGR crud and age had taken a toll. It'll possibly be some sort of sensor somewhere.!

[iantz Avid PP Poster! Find all posts View Profile Close iantz]

Maybe people should read all of the post including it's title before they get upset about people asking questions. Yes, there is a thread about D4Ds. This is not a D4D. There's certainly not a sticky about the 1kz. There's also no information on the 4wd action thread that is any use.

Anyway, to actually answer the questions and attempt to help someone out, have you tried cleaning the MAF sensor? There's info on this for the D4d but it's far more sketchy for the 1kz. Some posts suggest there isn't one but I can tell you there definitely is one. I have had a bit of a rough idle for a while which is why I looked into this. Anyway, on the 1kz just after the intercooler on the right hand bend is a big brass nut. Undo the nut and carefully take out the MAF sensor. Don't touch it. Then clean with MAF Sensor Cleaner which is a special spray that you can buy from the auto shops. I did mine and I have definitely noticed a difference. You could start with this.

My next question regards Injectors. Did you have them replaced at 150 thou? Or have you ever had them replaced? They can be a cause of the issue too. They're not overly expensive to have replaced and certainy nothing like the D4D. A mechanic is changing mine with reconditioned injectors for $600. So, check and clean the MAF, and then consider an injector swap.

Hope this helps.

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Thread title was changed to its current (more meaningful) title and moved to the correct section.

[allfie1968 Lurker Find all posts View Profile Close allfie1968]

hey thanks again , to clarify if it was me I wasn't getting upset just getting to the point . have only had prado since 140k , have had hiluxs and turbo diesel landcruisers before . I did while I had intercooler off clean the sensor ( is it the one coming off elbow of intercooler ) into throttlebody ? . the prado has a good service history major service at 110k but no mention of injectors.

[allfie1968 Lurker Find all posts View Profile Close allfie1968]

thanks mate that was an interesting read , I might check some sensors first

[iantz Avid PP Poster! Find all posts View Profile Close iantz]

I did while I had intercooler off clean the sensor ( is it the one coming off elbow of intercooler ) into throttlebody ?

Yes, that's the MAF. What did you clean it with exactly? Depending on what you cleaned it with (i.e., water, fuel, WD40 etc) that's probably a no-no and could be the problem. You need a good electrical contact cleaner or even better, the MAF cleaner mentioned.

[allfie1968 Lurker Find all posts View Profile Close allfie1968]

ok , thanks again no didn't spay with anything just cleaned the outer brass cage with a clean rag , i'll grab some spray cleaner and try it I read the forum on 4wd action re: coolant sensors , any idea where they or it is ?

[Pradonut Lurker Find all posts View Profile Close Pradonut]

It's worth checking your glow plug fuse also, that you're getting power to the plugs.

[allfie1968 Lurker Find all posts View Profile Close allfie1968]

does dash light still come on if fuse is blown ?

[allfie1968 Lurker Find all posts View Profile Close allfie1968]

ok I cleaned the sensor with maf cleaner , been out and about and hot starts have improved , test will be in the morning I guess . a lot of black gunk did come out