Backfire through throttle body
#1
Backfire through throttle body
I have an '89 W150 W/318 that runs like crap. I got this truck on trade and soon after I put it on the road it would just turn off at random times while driving(never the same conditions). I replaced the Hall Effect Sensor in the distributor and the issue went away. The truck seemed to be running rich all the time and was sluggish(more than an average tbi 318). I found that the previous owner unhooked the coolant temp sensor for the computer and plugged an aftermarket gauge into that port and left the sensor for the computer hooked up, but just laying on top of the engine. I put it back the way it should be and the rich exhaust smell went away and it ran fine for a while. Now when the truck is warm and I'm accelerating from a dead stop or nearly stopped, it will bog down and start backfiring through the throttle body. The truck has a new TPS and MAP sensor, good fuel pressure and injectors, so then I started thinking about the O2 sensor. To my surprise, there isn't one. Just exhaust manifolds, a y-pipe, no 02 sensors, and no catalytic converter.
Being that my truck is a former Federal Government vehicle for a national park, does anyone know if it's set up different than a civilian vehicle and doesn't have any 02 sensors, or it's because the previous owners hackery? The smog equipment has been removed as well but there's evidence it was once there. Could someone show me a picture of where the plug is for the 02 sensor?
Being that my truck is a former Federal Government vehicle for a national park, does anyone know if it's set up different than a civilian vehicle and doesn't have any 02 sensors, or it's because the previous owners hackery? The smog equipment has been removed as well but there's evidence it was once there. Could someone show me a picture of where the plug is for the 02 sensor?
#3
Super Moderator
O2 sensor should be replaced at 100,000 miles but I’ve burned them out sooner. If it’s bad it should go into a closed loop and set off a light on the dash I believe.
Last edited by Iowan; 01-01-2024 at 07:05 PM.
#5
#6
Mopar Lover
When it Boggs? it the transmission coming back to first gear when its trying to go..... Or is it staying and bogging in 3 gear or Overdrive?
It should come all the way back to first gear or at least kick down when you full throttle it going that slow?
It should come all the way back to first gear or at least kick down when you full throttle it going that slow?
#7
It will only bog down off the line and will backfire in second gear.
#8
Mopar Lover
I'm going to take a shot in the dark here..... I'm think the engine may be out of time... Could need a Timing gear set and chain...
Other than that... I'm currently out of ideas for you to check... Maybe some else has something to add?
Other than that... I'm currently out of ideas for you to check... Maybe some else has something to add?
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Iowan (01-03-2024)
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