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Unread 06-01-2016, 07:23 AM   #11
Not Yet Wild
 
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Default Re: 1988 par car backfire lack of power on inclines

Thanks for waiting guys, here we go... good & bad. compression sooo happy 95 for a number, yeah.. so I start looking at this timing thing with the manual open and looking at photos 1988 I see timing mark on engine case but can't seem to find the one on module??? do you guys have a photo NOT a drawing that would help me? Ok so I do some moving of module plate left and right... it was more toward 3 oclock than 4 BTW... I take it for test drives each time and still backfire when slowing down..... sometimes less sometimes more????? How about this baffles in muffler full of oil? ready to take it off and do this burn out thing..... Thoughts?? Waiting for your input... Thanks boys!!!
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Unread 06-01-2016, 01:26 PM   #12
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Default Re: 1988 par car backfire lack of power on inclines

I have doubts that timing is your issue. Those modules provide spark for 1/2 of your motor's rotation which is a huge tolerance. I have installed these on about 5 various carts now and I haven't had to time a single one yet. So long as the module isn't installed 180 degrees off then it should be ok. I don't think it would run at all if the module was set 180 degrees off.

Most backfire issues are caused by a carb's fuel valve not closing all the way when the accelerator isn't being depressed. This means that when you let up on the accelerator and ignition stops, the fuel valve isn't closed all the way and gas is still going into the cylinder. When you hit the accelerator again the new spark ignites all of that extra fuel and BANG, a backfire You may even notice this trend while driving in that the backfires are immediately after you stop then go again.

All the same, check out page 9 in the attached service supplement. It gives a good amount of detail on backfire prevention. It also talks about how to time those modules but, again, my experience has been to set them at the mid point and be done with it.
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File Type: pdf CPC_MANUAL_SERVICE_1986_1988_Supplement.pdf (523.4 KB, 0 views)
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Unread 06-02-2016, 06:07 AM   #13
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Default Re: 1988 par car backfire lack of power on inclines

Thanks for stopping by Lochlin and others, at my wits end yes i'm smiling and pulling my hair out... well i'm bald but you understand. Yep have gone over page 9, and am focused on your comment "This means that when you let up on the accelerator and ignition stops, the fuel valve isn't closed all the way and gas is still going into the cylinder. When you hit the accelerator again the new spark ignites all of that extra fuel and BANG, a backfire You may even notice this trend while driving in that the backfires are immediately after you stop then go again." the only spring I have for throttle to carb. is under cart under gas pedal, this was brought up by another about not shutting butterfly in carb. Man I don't want to take to a shop just seems I should be able to figure out myself. Live up here in NW Illinois on the Mississippi River. Am I just not understanding something. We tinkered with it and drove it 4-5 times on highway great power put yep when slowing down "BOOM"!!!!!!!
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Unread 06-02-2016, 09:26 AM   #14
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Default Re: 1988 par car backfire lack of power on inclines

It does seem like Lochlin is correct you are getting too much fuel. Most of us have no fuel flow problems. Follow the fuel path and see where and why!
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Unread 06-03-2016, 06:27 AM   #15
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Default Re: 1988 par car backfire lack of power on inclines

Hey you guys yep were getting there... old man's back is killing me from test drives and lifting the body up. Them carb. adjustment screws are touching have almost gotten all popping>back fire etc. gone.. can't thank you all enough from taking your time and helping hope ya all will be there for the next issue... Not trying to jinks myself!!! Again Thank You All... Peace > Love > In the U.S.A.
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Unread 06-03-2016, 09:11 AM   #16
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Default Re: 1988 par car backfire lack of power on inclines

Also your spark is not stopping as fast as necessary. Adjust the gas pedal to shut off the power just a little sooner. So a little sess gas and no spark when the pedal is released equals no backfire.
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Unread 06-03-2016, 12:25 PM   #17
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Default Re: 1988 par car backfire lack of power on inclines

Spot on as always TEW. You are the master.

Follow those steps in that manual to include the float adjustment. Everyone forgets about that one.

There is a chance your carb needs rebuilt / replaced. I am not crazy about those Walbro carbs. They work good but have too many parts for my liking. You can put a '80s era EZGo carb (Mikuni) on there if you want to get adventurous. You can get a knock-off Mikuni for about $30.

It sounds like you are close though. You'll get it.
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Unread 06-05-2016, 05:25 PM   #18
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Default Re: 1988 par car backfire lack of power on inclines

****Update**** between the carb screws and THEN that little ol' micro switch YEP! play> drive >drive> play... such a difference. Kudos and thanks again to Lochlin, tew45, backyard.
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Unread 06-05-2016, 11:24 PM   #19
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Default Re: 1988 par car backfire lack of power on inclines

Thanks for the update. That helps alot to know what the problem was. Sometimes people never let you know.
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Unread 06-07-2016, 04:06 PM   #20
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Default Re: 1988 par car backfire lack of power on inclines

I'm sorry guys but i'm back, really i'm no dummy but this thing just ain't a SB/BB Chevy. Cart starts and runs with power what is going on is I drive it up & down the highway 1/4 or less and around yard and it just"s stop's but in reverse it will kinda move, back to forward nothing, sit a moment minute or so and it will go again... Yes it acts like fuel filter but remember brand new.... don't want to start screwing with carb adj. again cause i'm afraid the backfire/poping will come back...float is good in carb.... Let me know I'm counting on you all... Thanks Again....
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