help 91 6 misses under acceleration
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help 91 6 misses under acceleration
hi guys just got this neat old truck BUT I got a good deal on it cause the thing drove the last owner nuts.... its a 91 /6/300ci. with 4 speed ... it runs fine as long as you don't get on it ... but starts to miss as soon as you do ...if you sort of feather the accel and let it catch up it will slowly gain speed. the FO had the plug wires replaced ..did a bunch of stuff like cleaning the fuel lines and so on to no avail ..he thinks its the computer (aint it always ) any way it acts very much like a bad accelerator pump on a carb model or possably no timing advance ...
any ideas (only had it for a few hrs... thought I would ask the experts before I tore into it ...)
thanks
jdodd
any ideas (only had it for a few hrs... thought I would ask the experts before I tore into it ...)
thanks
jdodd
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thanks a bout the fuel thing but
former owner swears he checked all that stuff an you can see where some fuel stuff has be replaced ...however bet he didn't check the diverter valve ... I just came back from a test drive in it ... and still find that it acts almost exactlly like a bad accell pump in a carb model ... runs ok a constant speed ..only seems to miss when you press on gas almost like its loading up ... did a lot of reading today about the fuel injection setup on this beast and plan to check the codes tomorrow ...however that has been done already as well ... by someone else . ..thing has lots of miles wonder if the cad converter is stoped up and causeing a rich running condition ... I will most likely run it a bit tomorrow and pull the plugs ..
jd
jd
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ouch... thanks ...will try the map sensor first ... but really thanks a lot for the help ..this is a great forum
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ok so its not the map sensor and I also cleaned the bypass valve (air) no change ..when I check the computer codes I get a 522 on the engine not running test ...thats susposed to mean that the truck is not in park ...but this is a stick shift ... maybe he put in the wrong computer ??? where can I find a number chart for the computer to check ...also the computer shows pass in the running check ... mmmm
next step is to check and see if the timing will advance ...by the way I found out that the former owner had this thing in 2 shops and no one could fix it ... so I am going to figure this out if it kills me cause he thinks he put one over on me I bet ...
jd
next step is to check and see if the timing will advance ...by the way I found out that the former owner had this thing in 2 shops and no one could fix it ... so I am going to figure this out if it kills me cause he thinks he put one over on me I bet ...
jd
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