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General Information => Troubleshooting => Topic started by: LoneWolf on March 01, 2009, 01:24:50 pm

Title: more pump questions
Post by: LoneWolf on March 01, 2009, 01:24:50 pm

if i push the throttle linkage on my pump down, the revs die down, and sometimes when im driving and stop at lights it revs up on its own.

 am i right in thinking that this isnt normal, healthy behaviour for an IP?


 mk2 GTD with AAZ by the way

Title: more pump questions
Post by: LoneWolf on March 02, 2009, 06:36:51 pm

Anyone?


 Please?

Title: more pump questions
Post by: vanbcguy on March 02, 2009, 08:00:48 pm

I wouldn't call that normal healthy behavior, no...

Does it seem like the linkage is binding?

Title: more pump questions
Post by: CODE4LS1 on March 02, 2009, 09:36:19 pm

Maybe the throttle cable is adjusted too tight?

Title: more pump questions
Post by: LoneWolf on March 03, 2009, 04:35:12 pm

the cables pretty slack tbh, stops me racing around too much.

linkage wise verythings still free moving, but its as if theresa bush of some description thats worn ot, but damned if i know where  :?

Title: more pump questions
Post by: Rabbit TD on March 03, 2009, 07:11:45 pm

I believe there is a bushing in there for the throttle shaft is your shaft seal also leaking by chance :?:

Title: more pump questions
Post by: LoneWolf on March 04, 2009, 12:04:32 am

no leaks that i can see no

Title: more pump questions
Post by: Smokey Eddy on March 04, 2009, 03:12:28 am

backing off the idle screw may make the weird increase in RPM on stand still go away?

pushing the throttle linkage and the rpm going DOWN i don't understand :( sorry

sounds like something internal like the governor or ... maybe the position of the boost pin?

Title: more pump questions
Post by: jtanguay on March 04, 2009, 09:25:07 am

almost sounds like your pump is sucking in air... either that or there is some severe vacuum on the fuel lines... (bad check valve or water separator)

Title: more pump questions
Post by: LoneWolf on March 04, 2009, 10:08:57 am

i thought about air leaks too, but ive sat on the wing as weve driven along, and i cant see any bubbles in the lines under load.



  the section that moves is in blue, but everything in the red is connected, so it all moves:

 (http://i45.photobucket.com/albums/f63/mattsissons/PumpRebuildKit2.jpg)

 im puzzled

 :?

Title: more pump questions
Post by: LoneWolf on March 08, 2009, 12:08:36 am

UPDATE: i tracked the sticking idle down to the cable, it wasnt greases in the rubber bush on the gas pedal, but now im experiencing another problem.

 the pump surges and seems to have a definate "pulse" to it at idle, and even if i turn the max fuel screw out it still revs itself back up again :?

 does anyone have any idea whats going on?

 because im totaly stumped :(