zhead240 Posted June 4 Share #1 Posted June 4 recently when i'm at a stop i hear low sounding backfire. does that mean i need a new valve? i looked them up on ebay. used $45 and new old stock $396 us. Link to comment Share on other sites More sharing options...
Yarb Posted June 4 Share #2 Posted June 4 There could be a multitude of various issues going on. What’s your diagnosis of it being a defective valve. Need some more in depth details. Link to comment Share on other sites More sharing options...
zhead240 Posted June 4 Author Share #3 Posted June 4 my diagnosis is the muffler is back fireing when i'm stopped or slowing down. don't hear it when up to speed. some one said was the carbs . i don't want to go down that road. Link to comment Share on other sites More sharing options...
Yarb Posted June 4 Share #4 Posted June 4 Again there are a lot of options here beginning with checking the timing and go from there. 1 Link to comment Share on other sites More sharing options...
zhead240 Posted June 4 Author Share #5 Posted June 4 might have to go to my mechanic Link to comment Share on other sites More sharing options...
Patcon Posted June 4 Share #6 Posted June 4 Valve adjustment would also be low hanging fruit 2 Link to comment Share on other sites More sharing options...
SteveJ Posted June 4 Share #7 Posted June 4 Does your car still have the solenoid to keep the throttle from slamming shut when you get off the gas? If it doesn't, then you have a sudden rich condition when you lift off the gas. 1 Link to comment Share on other sites More sharing options...
siteunseen Posted June 4 Share #8 Posted June 4 How old is the exhaust? I had an 325is that would pop out the back downshifting. The muffler was bad but I liked it. 1 Link to comment Share on other sites More sharing options...
zhead240 Posted June 4 Author Share #9 Posted June 4 not 100% sure but i believe i still have the solenoid. all the anti pollution still on this 72. can't recall how old exhaust is but i remember replacing muffler 10 years ago. Link to comment Share on other sites More sharing options...
SteveJ Posted June 4 Share #10 Posted June 4 But is the solenoid working? Link to comment Share on other sites More sharing options...
zhead240 Posted June 5 Author Share #11 Posted June 5 how can u test? and where is it located Link to comment Share on other sites More sharing options...
Yarb Posted June 5 Share #12 Posted June 5 Check the FSM. I’m sure it’s just jumping power to it and see if the solenoid engages. Link to comment Share on other sites More sharing options...
Yarb
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