Author Topic: Rough Idle (Read 18750 times)

mansvw · « **Reply #15 on:** May 31, 2007, 02:22:01 pm »

come on guys...... i now really need to get the car back on the road :cry:
its been a couple of weeks now, im sure there are some proper diesel pump experts on this forum.... a few of them hang around the IDI section... im calling out for your help...

has anyone had symptons like this and how did they resolve them, please

jimfoo · « **Reply #16 on:** May 31, 2007, 04:23:16 pm »

How exactly did you time it?

mansvw · « **Reply #17 on:** May 31, 2007, 05:55:45 pm »

i didn't exactly time it because i just verfied the TDC and flywheel markings..... in the process i replaced the timing belt and tensioner for added reassurance....

after all that the car still had the same old symptoms when it cam to starting it.... only now i've come to the other conclusion maybe "and that's a big maybe" the pump pulley has shifted and the pump is out of sync, because my pump don't have a key between the pulley and shaft.

so, im looking for one of those diesel pump timing gauges with "mm" reading scale on it.

the fault finding continues...... :cry:

jtanguay · « **Reply #18 on:** May 31, 2007, 07:48:15 pm »

i would say that until you have the motor timed within spec, don't expect a nice smooth idle :lol:

i had a jetta that i thought was going to rattle itself to death... it was pretty bad. still drove really great though with awesome mileage.

have you checked out your motor mounts??? i had a broken front mount a year ago... fine while driving, but idle was a bit off and going in reverse would be really bouncy etc...

mansvw · « **Reply #19 on:** June 01, 2007, 05:00:47 am »

"jtanguay"
the engine mounts are all okay, i changed the lot of them last year ( all three), their still fine.

did your motor also smoke with the rough idle? mine does, large clouds of white when i rev the engine.

:cry:

jimfoo · « **Reply #20 on:** June 01, 2007, 09:44:04 am »

Mine had lots of white when the timing was off. Loosen the IP bolts enough to be able to turn the pump, mark the current position, start the engine and rotate the bump slowly and see if that helps any. If it does, better get the dial indicator out. Also having bad glowplugs will give white smoke.

jtanguay · « **Reply #21 on:** June 01, 2007, 12:38:49 pm »

yea... white smoke revving at idle is bad timing... my old car did smoke white when cold though... but the compression wasn't the greatest..

mansvw · « **Reply #22 on:** June 01, 2007, 07:08:25 pm »

"jimfoo" Kool dude, i may give that a go, but it sound abit dangerous to me. i may just invest i a new dial indicator to be safe

i've replaced the glow plugs, so the white from the plugs is out of the question. cross my fingers and hope its the timing now.

mansvw · « **Reply #23 on:** June 03, 2007, 11:37:47 am »

I just to get a few things clear before i atempt to do any timing on the injection pump.

first of all is this my fuel cut-off valve i've arrowed in the picture?

would any know how to remove the timing plug from the center of the pump? i can't get a spanner on it due to the injection valves and a socket wouldn't fit because of the cable in the rear. whats the cable for, i thought it was just a plug?

jimfoo · « **Reply #24 on:** June 03, 2007, 12:03:01 pm »

That doesn't look like a normal IDI pump. Are you sure you don't have a TDI? I'm not sure what their pumps look like. On all the plugs I've seen, it is just a plug, no wires. Also there is nothing like you have pointed out that is above the fuel lines in any IDI pumps I've seen, just the LDA.

mansvw · « **Reply #25 on:** June 03, 2007, 12:52:08 pm »

"jimfoo" don't say that am already well confused, if your saying you've never seen that on IDI engines, im lost... ive also put aother pic of the engine bay below, hopefully that convinces you its a IDI. its turbo'd and no intercooler, its one of the last IDI models that were sold here.

mac.man25 · « **Reply #26 on:** June 03, 2007, 02:30:08 pm »

My suggestion for timing that beast is to pull that plug off (it looks like it just pulls off) and then see if there is something there you can unbolt. I had to use a socket wrench with an extension to get at mine.

As far as the fuel shut of valve goes, WEIRD! I don't have any suggestions really. sorry.

mansvw · « **Reply #27 on:** June 03, 2007, 03:17:29 pm »

"mac.man25" it don't look as if il be able to pull the cable out of the plug. here is a better picture, it looks as if the nut and cable are one piece unit.

ive got a exploded diagram of the pump and the plug can be seen at number 60. from the diagram its a one piece unit and it is called a impulse sender, it must do something :?
the other thing that i think is a fuel cut off valve is at number 62, but didn't have a discription

any1 know what size that plug maybe?

jtanguay · « **Reply #28 on:** June 03, 2007, 04:58:09 pm »

that looks like some early attempt to eliminate the need for a timing gauge to time the pump...

what are the two wires hooked up to??? maybe if you hook it up to a multimeter you could measure some sort of resistance from it...

i would much prefer having your setup, but also having the proper tool to digitally time the pump.

anyone else know what to do???

mansvw · « **Reply #29 on:** June 03, 2007, 05:20:35 pm »

the other end of those wires are connected up to the main engine wiring harness.

the only other way i can think of is to remove the first 2 outlet injection valves closest to the front of the car and get a spanner on it.

does any one know what the size spanner i would use?