Volvo RWD 140-160 Forum

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hard starting when cold 140-160 1974

Let me start by saying that I am no fuel injection guru. In fact, I'm pretty new to all of this. Oh, and I tried searching...

When I first bought the car it would start up on command with a little jab of the throttle. 2500 miles and 3 weeks later (yeah, I know) I'm having trouble getting it to start when cold (granted it's colder outside now). Not one to ask a question without consulting the manual, I have done and noted the following:

- re-gapped points to correct specs
- changed plugs
- replaced fuel pump with another used (and working) one
- pulled out cold start injector and tried to start the car--noticed fuel coming out (how much should be coming out?)
- adjusted the air-flow sensor plate to as close to the center as I could get it--also, the 0.02" distance between the plate and stop is correct on one side, but not on the other, so the arm is crooked (is that even possible?)

After all this, it's exactly the same, and I have exhausted the book's help.

I haven't looked for a vacuum leak or changed the fuel filter, but if it was either of those it wouldn't start up well when warm, right?

Where do I go from here? Any help would be appreciated.

Oh, and the car runs awesome once it's running.









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hard starting when cold 140-160 1974

Hello,

It sounds like you have the K-jet Bosch injection(constant injection, no wires on the injectors)

The K-jet system relies on fuel pressure to open the injectors and has a fuel pressure modifing device called a control pressure regulator(sometimes called a warm up regulator).

And if you suspect fuel problems, the 1st thing you need to do after making sure your fuel pump is running is to hook up the proper style of fuel pressure gauge and check the pressure when fully cold before running the car, during warm up and when fully warm.

Do you have a fuel pressure gauge that goes up to 6 bar(90psi) and the correct adapters?

--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90501








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hard starting when cold 140-160 1974

Yes! I do have K-jet! Don't know how I left that out...

After souring my greenbook, I see the section on the control pressure regulator. I do not, however, have a fuel pressure gauge. Since I will be buying this gauge, how do I know what the "correct adaptors" should be?

Forgive me, this is my first dive into the world of fuel injection.







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