Backfire Into Intake On Acceleration
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Backfire Into Intake On Acceleration
2.3L 92 Ranger 137k miles
No tag so can't test drive it on the highway.
Idles well.
Bogs down often but not always when you give it gas.
Backfires sometimes into intake when you give it gas.
Any thoughts?
No tag so can't test drive it on the highway.
Idles well.
Bogs down often but not always when you give it gas.
Backfires sometimes into intake when you give it gas.
Any thoughts?
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Joined: Jan 2004
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From: SW Va
Maybe a spark or cam timing issue, or srticking intake valves.
With the mileage on the vehicle, it's time for a new cam belt & with the mileage, intake valve carbon deposits also belong on your suspect list, especially if it's using some oil.
So maybe begin with a cyl balance test, followed by a compression check on at least the & suspect cyl's the balance test has flagged, if not on all 4 cyl's.
Let us know what you find.
With the mileage on the vehicle, it's time for a new cam belt & with the mileage, intake valve carbon deposits also belong on your suspect list, especially if it's using some oil.
So maybe begin with a cyl balance test, followed by a compression check on at least the & suspect cyl's the balance test has flagged, if not on all 4 cyl's.
Let us know what you find.
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Thanks for the replies guys. I haven't done anything with it yet but I'll look into the tests you guys mention.
Two other things:
1) It has had like 2 periods where it sat outside for 6 months straight without being started. Maybe even a year one time.
2) If I pump the gas peddle, I can get it to accelerate higher without bogging down. I have to finesse it really. Pump the peddle slightly until it starts to bog, let go, pump a little more... and each time you can increase the RPM until eventually it's high enough to put into gear.
Two other things:
1) It has had like 2 periods where it sat outside for 6 months straight without being started. Maybe even a year one time.
2) If I pump the gas peddle, I can get it to accelerate higher without bogging down. I have to finesse it really. Pump the peddle slightly until it starts to bog, let go, pump a little more... and each time you can increase the RPM until eventually it's high enough to put into gear.
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No, nothing of the sort. And come to think of it, it ran fine before the periods it sat. It sat through winter too. But I'm here in FL, so maybe not too bad?
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Yeah I was thinking about that but then why the backfire? But I will check the pressure.
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The mil light is off. I just got a code reader and will see if anything comes up.
I wanted to retry describing the symptoms again.
If I give it gas slowly it will rev up without bogging down or backfiring into manifold.
If I give it gas quickly it will bog down and sometimes backfire into manifold.
I wanted to retry describing the symptoms again.
If I give it gas slowly it will rev up without bogging down or backfiring into manifold.
If I give it gas quickly it will bog down and sometimes backfire into manifold.
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Scanner shows passed. There were two codes in memory for the MAF sensor though. But that could be from older problems.
Fleet Mechanic
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From: Boston, MA
I think when you pull the vacuum line of there should be some change when you drive I think you might have found your issue. Did you check that there was vacuum. You should do a FP test. Let's see what the other peeps say.
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I'm about to head up to autozone to rent the fuel pressure tester.