vacuum line on the prv help

[Dan Chatterley]

i have an 87 and it has a loose line right in the center its a yellow line and i cant find where it goes could someone send a picture where it goes

[DaviesKeymaster]

Don I will send an email to a fellow 780 owner with the PRV. I don’t have one at my shop but I’m sure someone can get you the photo. Thanks

[DaviesKeymaster]

Dan I will send an email to a fellow 780 owner with the PRV. I don’t have one at my shop but I’m sure someone can get you the photo. Thanks for joining the site.

[dn010Participant]

If it is the plastic, hard vacuum line that is running down the top middle of the intake, it connects to the fuel pressure regulator. I believe the other end runs to a nipple on the butterfly assembly/throttle body. I have a picture on my laptop, I will get it for you in a few hours.

[dn010Participant]

Is this the line you’re referring to?

 

[Corrida]

<p style=”text-align: left;”>Hi,</p>
<p style=”text-align: left;”>Can a faulty vacuum line cause poor/unsteady idealling?</p>

[dn010Participant]

If it happens to be that vacuum line pictured, that line controls your fuel pressure regulator so a leak will impact your fuel pressure. Any vacuum leak will result in poor engine operation since it is getting additional air and with EFI it is air that isn’t accounted for (MAF isn’t seeing it). A major leak can keep your engine from running or keep it bogged down during idle. Go over your rubber vacuum lines, anything that is cracked or brittle should be replaced. Any line that is resting on an engine part or engine compartment parts should be inspected since they can rub through and develop a hole due to all the vibration. If you’re suspecting the engine has a vacuum leak, get a can of starting spray or carb cleaner with a straw and spray it around, particularly the intake with the engine running. If you spray an area and notice the engine RPMs increase, it indicates you’ve got a leak there.

 

Cheers,

Dan B

[Author]

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