89 5 speed stock 5.0 backfire - Mustang Evolution

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Old 07-04-2013, 12:16 AM   #1
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89 5 speed stock 5.0 backfire

Hey wassup jus need some input on my car. When I purchased it a month ago it was doing the same issue. Everytime I accelerate like faster than usual my car I guess backfires from what seems to me the exhaust. It doesn't do it when I jus have it running and I rev it. It only does it when I accelerate harder than usual like going up a hill or passing another car. It does it on any gear too. I have changed the egr, maf, iac, cap an rotor new sparks and wires and oil fuel and air filter. The car was sitting in a garage for the past 7yrs before I bought it and like I said when I took it for a test drive it was doing this sputtering. Tomorrow I am gonna check the plug wires to make sure they are on in correct order cause when I changed them I did jus follow the way the old ones were. Lastly the car has the smog pump still on it with the belt running on its pulley but the hose that runs from it to the back of the head was broken so I jus eliminated it and bought some head plugs from late model to put on the head where this hose should be going. Again the car is stock and it's a 5 speed. Sry for the long story jus want to get this issue resolved cause I know I'm losing HP and has mileage.
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Old 07-04-2013, 12:36 AM   #2
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Sounds like it could be running to rich. Check your t-stat and coolant temp. Sensor.
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Old 07-04-2013, 10:00 AM   #3
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Sounds like it could be running to rich. Check your t-stat and coolant temp. Sensor.
I already changed the thermostat so I'm going to change that sensor. Hopefully that's it thx for your input brother.
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Old 07-04-2013, 11:18 AM   #4
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I already changed the thermostat so I'm going to change that sensor. Hopefully that's it thx for your input brother.
Have you looked to see what the fuel pressure is at and looked to see what the timing set at thats where I would start after you make sure the wires are in the right spots lol
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Old 07-11-2013, 09:16 AM   #5
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I had this happen 3 times on 2 mustangs and a half ton f-150. Lmao. First time scared the $h!t out of me. Then I drove around town like that until my shop teacher said take off the smog pump and all that junk associated with it and plug the heads. Did just that and it never did it again. After that the other two vehicles were just an afternoon of effing around with all that "junk".

---------- Post added at 08:16 AM ---------- Previous post was at 08:15 AM ----------

Think he said it was plugged cat converter.
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Old 08-06-2013, 07:47 PM   #6
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Found out my issue is my fuel pump. Question now is should I upgrade straight to a 200+ lph pump cause I am planning on upgrading my injectors sometime next yr or should I jus go with something smaller like a 110lph?
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