News:

This forum is run by RPM and donations from members.

It is the donations of the members that help offset the operating cost of the forum. The secondary benefit of being a contributing member is the ability to save big during RPM Holiday sales. For more information please check out this link: Membership has its privileges 

Thank you for your support of the all mighty FJ.

Main Menu

FJ idles but dies if throttle is opened

Started by Jan, March 13, 2015, 01:44:12 PM

Previous topic - Next topic
Print
Go Down Pages1
User actions

Jan

March 13, 2015, 01:44:12 PM
Hi all

My FJ 1200 from 1992 rested for 4 years in the garage. After that I had fixed some issues and was driving her about 10km.
Another 7 months went by.   
Now, when I start the motor it idles (choke of) but immediately dies down when I pull the throttle.
I suspect a carb problem.

Did I not clean it properly? Today, I had the main and pilot jets soaked in some carb cleaner. Floats and needles seem to move freely. The slides appear to behave fine (move back into position with a nice swoosh).

Any hint is greatly appreciated. 

Jan :bye:

FJmonkey

#1
March 13, 2015, 02:12:14 PM
The pilot jets are still clogged, being the smallest they don't clean with a simple soaking. Ultrasonic bath works well and using a nylon bristle can also clear out a pilot jet.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

FJ_Hooligan

#2
March 13, 2015, 02:25:17 PM
Also, make sure you disassemble the idle mixture screws and clean out that passage by spraying  carb cleaner through the pilot jet port and the air pilot port.

Hold the pilot jets up and see if you can see light through them.  If not, then they're still clogged.
DavidR.

Jan

#3
March 13, 2015, 02:35:54 PM
FJmonkey, Thanks for the advise
Actually,I could not really see the hole in the pilot jets when I held them against a light source. I thought, well, perhaps my eyesight is not good. Also, i do not really understand the function of the pilots. I believed they would provide the fuel during idling (a manual says "Leerlaufdüse"). But perhaps it is not as easy  :scratch_one-s_head:

I guess, removing the carbs will be even easier the third time. The first time was a nightmare, but today it went smoothly. I´ll find an ultrasonic thing.

Dan Filetti

#4
March 13, 2015, 02:45:36 PM
Quote from: Jan on March 13, 2015, 02:35:54 PM
I´ll find an ultrasonic thing.

http://www.harborfreight.com/ultrasonic-cleaner-3305.html

with the 20% coupon you can find in the back of lots of magazines, it'll be less than $30....

FYI,

Dan
Live hardy, or go home. 

FJmonkey

#5
March 13, 2015, 03:42:11 PM
Good find Dan, clean one carb while you are reassembling the cleaned one, do a few more times, then you will have a really happy FJ. Make sure you use a cleaner safe for aluminum. You don't want your carb pieces getting smaller and lighter and jets falling out.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

Dan Filetti

#6
March 13, 2015, 05:52:02 PM
Quote from: FJmonkey on March 13, 2015, 03:42:11 PM
Good find Dan, clean one carb while you are reassembling the cleaned one, do a few more times, then you will have a really happy FJ.

There's a 2.5 liter job (larger capacity), for maybe twice the $$ too:

http://www.harborfreight.com/25-liter-ultrasonic-cleaner-95563.html

FYI,

Dan
Live hardy, or go home. 

Jan

#7
March 18, 2015, 12:28:43 PM
Thanks Guys :good2:,

I put the pilot jets into the ultrasonic bath. And now it runs!!

Thanks again,
Jan
Print
Go Up Pages1
User actions