Causes for lowered gas preformance?

[jdbubb at verizon.net (Dan Bubb)]

The platinum's, in my experience, don't seem to work so well in the 8V's. They seem to miss easily at idle. So, Bosch copper, or NGK as Brian points out, are both a better solution as far as I'm concerned.

As far as the gas mileage, check your vacuum lines. You should have a vacuum line from the back of the throttle body to the advance canister on the distributor. At idle, with the throttle plate fully closed, you should feel no vacuum a the distributor end. You should however feel vacuum at the distributor end if you open the throttle primary plate so the engine's running at 2000 RPM or so.

If you have a timing light, with the vacuum advance disconnected, as you rev the engine you should see the timing advance. With the vacuum connected you should see 10-15? degrees additional advance.

If your mechanical advance isn't working correctly (you don't see any advance with increasing RPM with vacuum disconnected) you will feel a distinct lack of pep. If your mechanical advance is working correctly, but vacuum advance isn't, then the engine will have the same WOT performance, but mileage will really suffer under part throttle conditions and to some extent the engine will feel less responsive.

Dan

From: "Neptuno" <neptunonc@yahoo.com>
Sent: Monday, December 18, 2006 11:10 AM
Subject: Re: Causes for lowered gas preformance?


> What about spark plus. I have heard at least for the 1.7ltr that I have (and maybe all 8v) To stick with the copper Bosch plugs W7D IIRC. last time that I did a tune up I bougth the platinum Bosch replacements (I think they may actually suck)
>   
>  When I went to the FLAPS yesterday they again had the platinum ones. I refused to buy them. I am going to try and find the plain old copper Bosch plugs.
>   
>  What says the list?
>   
>  Thx
>   
>  EL T
> 
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