5.0 GI PWTR recommended RPM

[1994almeida]

Hi
On my Volvo 5.0 GI PWTR TBI engine when I reduce the engine power, the engine not return to the recommended RPM +/- 650 .
Moving the Throttle lever to full close position the throttle doesn?t close totally, so the RPM doesn?t drop to 650 RPM.
I think the problem is the coil force that is not enough to close totally the throttle.
I install provisory another coil, and with this new coil the idle engine is OK.
What could be the problem?
The original red coil is damage without enough force? The replacement isn?t an easy job?
Or the Throttle cable is damage (he couldn?t be lubricated) ?
My provisory solution (installation of another coil) is a suitable solution?.
Thank you

 

[Fun Times]

Hi there, the usual problem with these Volvo engine models when they don't return to idle without manual help is the cable itself.

In "some cases" you are able to restore the cable back to a working condition by using a bit of sand paper on the inner slide of the throttle cable to remove and rust type substance then lube the cable real well.. You should be able to slide the black rubber boot where the inner and outer cable meet to help get some lube further in/down the cable.

If not, you'll need a new cable.

Your shift cable may be next on the list as they have a tendency to fail first.

 

[dypcdiver]

I had the exact same problem on my 5.0 Gi PWTR last year. It turned out to be the inner cable that had developed a slight twist over the previous 14 years.
All that mine required was to disconnect the cable by removing the split pin and checking that the throttle arm was against it's stop.
Then by slackening the lock nut on the cable I was able to adjust the pivot eye (with the remote handle in the centre) so that it slid over the throttle arm pin without resistance and was perfectly flat on the arm, I replaced the washer and split pin and have had a perfect 650 RPM tick over ever since.

 

[Bondo]

I had the exact same problem on my 5.0 Gi PWTR last year. It turned out to be the inner cable that had developed a slight twist over the previous 14 years.
All that mine required was to disconnect the cable by removing the split pin and checking that the throttle arm was against it's stop.
Then by slackening the lock nut on the cable I was able to adjust the pivot eye (with the remote handle in the centre) so that it slid over the throttle arm pin without resistance and was perfectly flat on the arm, I replaced the washer and split pin and have had a perfect 650 RPM tick over ever since.

Ayuh,.... I believe that is the cure to almeida's problem,.....

Get rid of the extra springs ya got on there, 'n do what dypcdiver says,...
I'll only add, there should be the slightest resistence, with the cable pushin' the throttle arm against it's stop screw,....

 

[1994almeida]

Thank you
The pivot eye is center with the remote handle. The cable slid over the throttle arm pin without resistance
Do you suggest replacing the Spring?
Is an easy job?

 

[dypcdiver]

Lets get back to basics. Remove the throttle cable and all those springs. Start the engine and allow it to warm up, flick the throttle arm and allow it to return to it's normal position, does it now tick over at 650 RPM?

If it does then the problem is the Cable or the remote throttle mechanism. I assume you lube the cams and the exposed ends of the cable regularly.

If it does not tick over at 650 RPM then there is a problem at the TBI which could be many things from a bent or worn butterfly shaft through to air leaks at the TBI to manifold flange or even the manifold gasket itself. I doubt it is the spring you have highlighted unless it is broken, they don't just get weak.

 

[1994almeida]

Solved the problem with these actions:
Lubricate the cable cams, the exposed ends of the cable and the remote throttle mechanism.
Improve the cable route, without hard bends.
Adjust the pivot eye of the cable (2 turns off) so that it slid over the throttle arm pin without resistance.
Thank you.

 

[Bondo]

Solved the problem with these actions:
Lubricate the cable cams, the exposed ends of the cable and the remote throttle mechanism.
Improve the cable route, without hard bends.
Adjust the pivot eye of the cable (2 turns off) so that it slid over the throttle arm pin without resistance.
Thank you.

Ayuh,... Did ya remove the extra springs ya put on it,..??

The cable should be pushin' the throttle lever closed, with slight pressure,....

 

[dypcdiver]

1994almeida Thanks for letting us know your problem has been solved, it might just help other who use the "search" and come across your post.

 

[1994almeida]

Yes I remove the extra springs,
Now the cable pushin' the throttle lever closed, with slight pressure,.... and 650 RPM are OK.
Thank You