Stalling and backfiring
#1
93 Touring
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Thread Starter
![FL](https://www.rx7club.com/images/icons/fl.jpg)
Replaced the alternator so now voltage is strong.
Checked the clutch switch, it is extending completely - not sticking.
Car will start, idle at 750 with ac off.
But if you just let it sit there, maybe 5 minutes until it will sputter and stall.
Same effect if it has been driven then parked to idle.
When driving, car is prone to stall at low rpm or at red lights.
Fuel filter is good. Plugs are new.
Backfiring is getting progressively worse especially when slowing down in say 2nd.
Checked for vacuum line issues, everything seems tight.
Map sensor is plugged in.
Thinking about raising the idle -- But, it should be able to sit at 750 and idle all day, right?
Thanks for any insight.
Checked the clutch switch, it is extending completely - not sticking.
Car will start, idle at 750 with ac off.
But if you just let it sit there, maybe 5 minutes until it will sputter and stall.
Same effect if it has been driven then parked to idle.
When driving, car is prone to stall at low rpm or at red lights.
Fuel filter is good. Plugs are new.
Backfiring is getting progressively worse especially when slowing down in say 2nd.
Checked for vacuum line issues, everything seems tight.
Map sensor is plugged in.
Thinking about raising the idle -- But, it should be able to sit at 750 and idle all day, right?
Thanks for any insight.
#2
RX-7 Bad Ass
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iTrader: (55)
Have you checked the dash pot on the throttle body? That can cause stalling when coming to a light. Easy thing to check.
Dale
Dale
#3
93 Touring
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Thread Starter
Dale,
Checked the Dashpot -- might be the culprit.
1. plunger only extends 1/8 inch -- I cleaned it but it still only does 1/8th.
2. You can grab it and pull it all the way out BUT, that's only 1/4 inch
3. it's not sticky, it is springy
could it have broken off at some point, thought it was supposed to be longer
Is there any adjustment to move the plunger out farther? I don't see any.
![](http://i240.photobucket.com/albums/ff189/3031alatka/dashpot004.jpg)
Checked the Dashpot -- might be the culprit.
1. plunger only extends 1/8 inch -- I cleaned it but it still only does 1/8th.
2. You can grab it and pull it all the way out BUT, that's only 1/4 inch
3. it's not sticky, it is springy
could it have broken off at some point, thought it was supposed to be longer
Is there any adjustment to move the plunger out farther? I don't see any.
![](http://i240.photobucket.com/albums/ff189/3031alatka/dashpot004.jpg)
![](http://i240.photobucket.com/albums/ff189/3031alatka/dashpot005.jpg)
#5
93 Touring
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Thread Starter
arghx,
Car is stock.
Fresh rebuild with New Housings and New Engine Wiring Harness
stock ECU
downpipe
aluminum AST
Cold air intakes
Problem is with stalling at red lights and backfiring (more and more) while decelerating.
Thanks
Car is stock.
Fresh rebuild with New Housings and New Engine Wiring Harness
stock ECU
downpipe
aluminum AST
Cold air intakes
Problem is with stalling at red lights and backfiring (more and more) while decelerating.
Thanks
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#9
93 Touring
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Thread Starter
Replaced the dashpot, that was One of the problems.
Ran it all the way down until low fuel light came on == for some reason, that
also helped.
Backfiring is still an issue, but not nearly as bad and car does Not stall now.
Ran it all the way down until low fuel light came on == for some reason, that
also helped.
Backfiring is still an issue, but not nearly as bad and car does Not stall now.
#10
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I've had an issue similar to this before. I had a new engine put in, build by Atkins rotary, and it would be hard to start, die and back fire a lot. It ended up being that the engine was badly assembled/built. I sure hope this isn't the case for you. Have you checked engine compression?
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03-20-18 01:54 PM