97 Winstar Codes PO171 PO174

Joe's Newsgroup > wrote:
>Runs rough at idle, but seems to be Ok when throttle is opened any more.
>
>Cannot find vacuum leaks, all appears to be ok.
>Changed plugs because they needed to be changed.

I bet a dollar there's a vacuum leak there. Clean the PVC, check the fuel
pressure at the rail, and if those don't do it, start looking more aggressively
for vacuum leaks. That might mean borrowing a smoke machine from someone.
That 28.9% short-term fuel trim is not a good sign.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Thanks everyone.

Will do.

Joe

"Scott Dorsey" > wrote in message
...
> Joe's Newsgroup > wrote:
>>Runs rough at idle, but seems to be Ok when throttle is opened any more.
>>
>>Cannot find vacuum leaks, all appears to be ok.
>>Changed plugs because they needed to be changed.
>
> I bet a dollar there's a vacuum leak there. Clean the PVC, check the fuel
> pressure at the rail, and if those don't do it, start looking more
> aggressively
> for vacuum leaks. That might mean borrowing a smoke machine from someone.
> That 28.9% short-term fuel trim is not a good sign.
> --scott
>
> --
> "C'est un Nagra. C'est suisse, et tres, tres precis."