Author Topic: Injection pump spring (Read 5945 times)

chemist · « **on:** January 13, 2008, 06:51:24 pm »

91 Jetta NA, all of a sudden stalls out at idle and can not adjust by turning in idle screw without over revs. I removed the injection pump cover only to find that the spring going to the cold start lever was gone! It had broken. Now I can't seem to find one anywhere.

Can I just use any old spring and try and fit it in there or am I cooked?

Brad

dillenger1 · « **Reply #1 on:** January 14, 2008, 09:43:12 am »

How could you see the cold start spring from the top?Are you talking about the govern. spring?I have a gov. assembly from a peugoeut 505 minus the intermiadiate spring,but Ive got a vw int. spring.

chemist · « **Reply #2 on:** January 14, 2008, 09:57:39 am »

It is not the governor nor the throttle rod springs. The throttle rod attachs to the push plate and in this model there is a secondary plate attached to the main push plate which has a spring pulling it back to hook on a lever coming through the pump cover which is attached to the cold start assembly below. It is this spring which is gone and helps maintain a proper idle.

brad

jimfoo · « **Reply #3 on:** January 14, 2008, 10:00:05 am »

Are you sure your pump had one, not all had the separate spring. Some were on the governor assembly in front of the intermediate spring. If it was there and is no longer, you'd better get the pieces out. Also have you tried adjusting the residual fuel screw if the spring is on the governor?

Vincent Waldon · « **Reply #4 on:** January 14, 2008, 10:27:06 am »

I believe the OP is talking about the internal spring that is activated by cold-start levers equipped with a fast-idle option... the internal spring is built into the top lid and tugs the fuel sleeve lever towards the fast idle stop. You have to unhook it when pulling the lid.

It's been a while since I've had a fast-idle lid off, but I believe that spring just flips the lever from stop to stop, so it's probably not overly special from a rate perspective... finding a similar spring length wise and diameter wise would likely be ok to try.... others may chime in here.

Or find an old pump... or a Bosch dealer ??

chemist · « **Reply #5 on:** January 14, 2008, 11:07:16 am »

Thanks Vince, you've got it right. I'm glad you think that any spring that fits will work I've got a couple to try. My problem is that as it is now without the spring the idle wanders from an ok idle to very fast and then too slow and kills the engine. This is particularly true when I put the clutch in, it revs high then slowly goes to nothing and dies, very annoying in traffic (I have to keep my foot on brake and accelerator at the same time--not a good idea).
Not looking forward to taking it apart again in this snowstorm. I had fished out one little piece of broken spring and fished for more with a magnet, but the fish weren't biting, must be lying on the bottom of the pump housing hopefully minding their own business.

Brad

jimfoo · « **Reply #6 on:** January 14, 2008, 11:26:26 am »

I haven't seen that spring, but I imagine it isn't very big. How about the spring from a ball point pen cut to the correct length? Price-almost free.