# 1990 240sx idling problem **URL:** \ **Category:** Canada Nissan Automotive\ **Created:** [May 31, 2006, 8:58am UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733 "2006-05-31T08:58:56Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![240DRIFTz](https://avatars.discourse-cdn.com/v4/letter/2/bbe5ce/32.png) [@240DRIFTz](https://forums.speedlife.net/u/240DRIFTz)\ **Post date:** [May 31, 2006, 8:58am UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/1 "2006-05-31T08:58:56Z")
my 90 240 idles reaaaly rough…the engine shakes in the engine bay and when in nuetral it sometimes seems like the car is going to die…it drives fine and pullls hard but just idles reaaally rough…i had a another motor in before and blew the head gasket and allot of gunk got into everything like exhaust and heating core so it still has a sweet smell coming from the exhaust when its running…i dont know what this problem could beeee :roll: ---
**Author:** ![Nis240](https://avatars.discourse-cdn.com/v4/letter/n/a9a28c/32.png) [@Nis240](https://forums.speedlife.net/u/Nis240)\ **Post date:** [May 31, 2006, 4:10pm UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/2 "2006-05-31T16:10:14Z")
Spray a can of Carb cleaner in the Intake manifold, it will clean some of the sludge that build on the IAC valve. ---
**Author:** ![beatshack](https://avatars.discourse-cdn.com/v4/letter/b/f0a364/32.png) [@beatshack](https://forums.speedlife.net/u/beatshack)\ **Post date:** [May 31, 2006, 4:21pm UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/3 "2006-05-31T16:21:09Z")
does he have an aftermarket FPR? if so whats the base fuel pressure at? ---
**Author:** ![240DRIFTz](https://avatars.discourse-cdn.com/v4/letter/2/bbe5ce/32.png) [@240DRIFTz](https://forums.speedlife.net/u/240DRIFTz)\ **Post date:** [June 1, 2006, 10:30am UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/4 "2006-06-01T10:30:05Z")
spray carb cleaner in the eccs? i think it might be from my exhaust… becuase ther was so much sludge and that spraying out when it had a blown head gasket and another thing my coolant goes down realllly fast i have to fill it like once a week ---
**Author:** ![beatshack](https://avatars.discourse-cdn.com/v4/letter/b/f0a364/32.png) [@beatshack](https://forums.speedlife.net/u/beatshack)\ **Post date:** [June 1, 2006, 11:43am UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/5 "2006-06-01T11:43:42Z")
your coolant goes down!? :o Are you sure your head gasket isn’t blown on this motor too? Better do a compression test, take off the rad cap and see if any air bubbles come out while the crank is turning over (takes 2 people). If bubbles come out, your head gasket is gone and/or your head is warped. ---
**Author:** ![drader](https://avatars.discourse-cdn.com/v4/letter/d/9dc877/32.png) [@drader](https://forums.speedlife.net/u/drader)\ **Post date:** [June 1, 2006, 1:14pm UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/6 "2006-06-01T13:14:02Z")
So do you pull the air pipe thing off of the front of the throttlebody and spray it in there? And if you do, do you spray with the throttle plate open or closed, motor running or not? :oops: I am having the same problem… ---
**Author:** ![beatshack](https://avatars.discourse-cdn.com/v4/letter/b/f0a364/32.png) [@beatshack](https://forums.speedlife.net/u/beatshack)\ **Post date:** [June 1, 2006, 1:34pm UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/7 "2006-06-01T13:34:06Z")
Theres a few ways you can do it. I use similar stuff called Combustion Chamber Cleaner (avail at Canadian Tire). Take a vacuum hose coming from the throttle body and spray short bursts into the hose. The car will want to die, but it keep it running by opening the throttle a bit by hand every time it tries to stall. Use the entire can. Rev the car until all the smoke is done coming out (there will be LOTS of carbon-smoke pouring out your exhaust). This is also a good way to check for exhaust leaks, as you can see the smoke pouring out of any cracks/leaks in the manifold, turbo, dp, etc. Change your oil right after, it will be pure filth. Just a note of caution, when I used this stuff on my high mileage Talon, it actually created an exhaust leak at the exhaust manifold, cleaning out carbon deposits that were acting as seals. ---
**Author:** ![CA18DET-180SX](https://avatars.discourse-cdn.com/v4/letter/c/e0b2c6/32.png) [@CA18DET-180SX](https://forums.speedlife.net/u/CA18DET-180SX)\ **Post date:** [June 1, 2006, 3:51pm UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/8 "2006-06-01T15:51:46Z")
> [@beatshack](#): > > Just a note of caution, when I used this stuff on my high mileage Talon, it actually created an exhaust leak at the exhaust manifold, cleaning out carbon deposits that were acting as seals. Same thing happened to an old truck I used to have. But when I use Combustion Chamber Cleaner on aything I spray about 3/4s of the can into it with the engine running, and adjusting the throttle so it stays running. Then I either shut the engine off or stall it out with the cleaner and spray the rest into it. Let it sit for about 5-10 minutes then take it out and bag on it till smoke stops pouring out (there will be LOTS) ---
**Author:** ![240DRIFTz](https://avatars.discourse-cdn.com/v4/letter/2/bbe5ce/32.png) [@240DRIFTz](https://forums.speedlife.net/u/240DRIFTz)\ **Post date:** [June 1, 2006, 6:39pm UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/9 "2006-06-01T18:39:45Z")
im pretty sure my head gasket is fine considering it drives fine…i did a compression test and it was perfect at stock compresion so thats why i put it in…the engine is in good shape the oil is perfectly clear…im gonna try spraying that carbon stuff n see if that works ---
**Author:** ![beatshack](https://avatars.discourse-cdn.com/v4/letter/b/f0a364/32.png) [@beatshack](https://forums.speedlife.net/u/beatshack)\ **Post date:** [June 2, 2006, 10:31am UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/10 "2006-06-02T10:31:54Z")
[quote=“CA18DET-180SX”] > [@beatshack](#): > > Just a note of caution, when I used this stuff on my high mileage Talon, it actually created an exhaust leak at the exhaust manifold, cleaning out carbon deposits that were acting as seals. Same thing happened to an old truck I used to have. But when I use Combustion Chamber Cleaner on aything I spray about 3/4s of the can into it with the engine running, and adjusting the throttle so it stays running. Then I either shut the engine off or stall it out with the cleaner and spray the rest into it. Let it sit for about 5-10 minutes then take it out and bag on it till smoke stops pouring out (there will be LOTS)[/quote] ^^ yeah thats the correct way to use the stuff… sorry I left that out! ---
**Author:** ![beatshack](https://avatars.discourse-cdn.com/v4/letter/b/f0a364/32.png) [@beatshack](https://forums.speedlife.net/u/beatshack)\ **Post date:** [June 2, 2006, 10:40am UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/11 "2006-06-02T10:40:45Z")
> [@240DRIFTz](#): > > im pretty sure my head gasket is fine > considering it drives fine…i did a compression > test and it was perfect at stock compresion so thats > why i put it in…the engine is in good shape the oil is perfectly > clear…im gonna try spraying that carbon stuff n see if that works I still don’t understand how you’re losing coolant. It has to go somewhere… it either leaks, burns or evaporates from boiling. I can understand if you recently flushed the system and its still burping air. ---
**Author:** ![240DRIFTz](https://avatars.discourse-cdn.com/v4/letter/2/bbe5ce/32.png) [@240DRIFTz](https://forums.speedlife.net/u/240DRIFTz)\ **Post date:** [June 2, 2006, 11:42am UTC](https://forums.speedlife.net/t/1990-240sx-idling-problem/142733/12 "2006-06-02T11:42:43Z")
yea i did recently flush the system…cuz i got a diff rad cuz mine had a hole in it the guy say to do another flush sometime soon because ther was so much sludge in there