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rough idle after.... #738413
July 18th 2018 11:28 pm
July 18th 2018 11:28 pm
Joined: Dec 2017
Posts: 88
nebraska
J
jason159 Offline OP
journeyman
jason159  Offline OP
journeyman
J
Joined: Dec 2017
Posts: 88
nebraska
I put on a set of Mopar Micky Thompson valve covers on my '75 B100 and now it's idling rough. I think it has to do with the PCV valve because if you touch it a bit it'll actually die out. I'm not understanding what is now different, because my van ran great with the stocker covers. The vacuum hose is good. I have no problem putting the OEM ones back on really, I'd just like to know what happened, lol. The MT's have a small "dish" or oil splash shield on the inside to keep oil from vacumming into the carb, I wonder if it's an air-volume deal? Thoughts appreciated!


1975 Dodge B100 shorty. 318, 3/tree
Re: rough idle after.... [Re: jason159] #738443
July 19th 2018 1:17 pm
July 19th 2018 1:17 pm
Joined: Nov 2013
Posts: 1,236
West Texas
W
Wedgy Offline
old hand
Wedgy  Offline
old hand
W
Joined: Nov 2013
Posts: 1,236
West Texas
Hi Jason,

Well that's a good one. I'd also be tempted to reinstall the stock covers, but I sure would be curious as to the effect on the PVC flow.

PCV valve blocked by contact with the baffle? Check for vacuum at the Breather opening on the opposite valve cover? A slip of paper should be gently drawn onto the opening by vacuum.


I just went through an Idle situation on my TBI 318 '88 B250 Had to learn a lot and read up on that part.

Maybe a shorter valve body on the PVC if so ? Could be that easy.

Good Wrenching and Van On 318's!

Last edited by Wedgy; July 19th 2018 1:19 pm. Reason: fixins
Re: rough idle after.... [Re: jason159] #738444
July 19th 2018 1:28 pm
July 19th 2018 1:28 pm
Joined: Aug 2001
Posts: 12,030
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 12,030
Fircrest, WA
Interesting. What happens if you pull the PCV valve and put your finger over the end if it while the engine is running?


Windows- they're what make a van worth owning!
Re: rough idle after.... [Re: jason159] #738445
July 19th 2018 2:17 pm
July 19th 2018 2:17 pm
Joined: Nov 2013
Posts: 1,236
West Texas
W
Wedgy Offline
old hand
Wedgy  Offline
old hand
W
Joined: Nov 2013
Posts: 1,236
West Texas
I'm gonna look at some vacuum diagrams. A leak? Might could take some Vacuum readings, There's two kinds I found out.
I love a good Mystery...


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