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View Full Version : Red top sr20det idel prob! help

wings_s13
06-09-2009, 01:56 AM
Ok so i just picked up a 1990 nissan 240sx with a red top sr20 in it. it was rebuilt and has hks cam's and jtw cam gears(this is all acording to the guy i got it from :/ ). so it dies as idle will idle ruff when started and the will die a few min latter, also it get a little worse after u dirve the car around for a bit. also it will not die if u keep giving it gas and dose not die while driving. dose any one have any clues? me and my room mate are going to check it out tomorrow, anyhting helps thanks.
fliprayzin240sx
06-09-2009, 07:03 AM
What kinda HKS cams?!?! HKS cams doesnt idle like crap, unless who ever installed it fucked up the mechanical timing...
wings_s13
06-09-2009, 09:59 AM
he said stage 2, me and my room mate aregoingout there now. he said the car ran fine untill a mec thought he needed o adjust the ign timming and now it runs like crap. so yeah hoping all it is is the ignition timming.
wings_s13
06-09-2009, 02:10 PM
ok so messed with the ingnition timming and help a little, but still idles really ruff. could it be the cams are to agressive? or?? any thing helps thanks!
wings_s13
06-09-2009, 10:31 PM
NO one, really??
slow40sx
06-09-2009, 10:38 PM
ok so messed with the ingnition timming and help a little, but still idles really ruff. could it be the cams are to agressive? or?? any thing helps thanks!

the cams aren't that agressive, by rough idle do u mean it jumps around?
johngriff
06-09-2009, 11:03 PM
It really sounds to me like you have a vacuum leak or an exhaust leak.

IF, you should, need to, have to, reset the timing.

Set up the timing light on the ignitor pickup.

Start the engine, wait until it is at operating temp

Disconnect the TPS sensor while the engine is running

make sure the idle is between 750 and 1200.

Set the timing to 15degrees btdc.

Write me if you have any other questions.

John
johngriff
06-09-2009, 11:13 PM
You sound like you know what you are talking about, I have a redtop sr20 all stock for the most part, for some odd reason it will not idle with the air filter off of the MAF sensor, but the car drives and builds boost perfectly, and then if i put an air filter on the MAF the car idles fine but when i give it gas it won't rev over 3000rpm and starts makin a BAP BAP BAP sound it sounds exactly like honda 2 step, i dunno what the deal is, could it be my MAF sensor is fucked up? please let me know if you have any ideas thank you

Sounds like with the air filter off, you are not bending the pipe by the maf so it is staying sealed.. just not idling right probably because of the open pipe.

With the filter attached, you are probably bending the pipe, causing it to leak worse, the symptom you described is a NO MAF situation.

Post a picture of your engine bay with the filter attached?

Maybe move around the afm and pipe while the engine is running and see if it effects the way the car idles?

John
wings_s13
06-11-2009, 05:27 PM
getting it checked out today, will post pics of engine tonight. also it idle ruff when starting and the car fights it it will kick it self up rpms and then go back down, once the car is at opperating temp then it just die when at idle, but aother then that when driving ther car rus fine. the maf and all that is hooked up but will post pics. thanks for the help guys hope it gets fixed soon thanks