Topic: Backfiring through the TB after TB and injector install

[sharpxmen]

IN ADDITION TO THE PREVIOUS POST:

could this be my maf sensor? As i was swapping the TB and the sensors i did spray a good amount of carburetor cleaner directly into the little rubber elbow that later goes over the vacuum port on the TB.

Would a bad maf sensor give me these rando
 backfires at WOT but have the car run well otherwise?

there is no MAF on your Jeep, but there is a MAP - and yes, a bad MAP can cause those symptoms

i have no idea which rubber elbow you mentioned, if you didn't spray brake clean directly into your MAP sensor port it should be fine unless there is a restriction on the port or the line that goes to it (in case is not on your t/b) so the vacuum reading on the map is wrong. Make sure that rubber elbow was not "melted" by the brake clean and that is not soft causing it to colapse under vacuum (and that it does flow air freely and is not obstructed in any way).

[MYSTANGT]

Im going to take a look.

I didnt think that it would dry up the rubber enough to cause any issues but ill check just to be sure.

[dwtaylorpdx]

On mine if you slowly increased the throttle not punch it you could drive without causing the backfire
If its not letting you drive through it, then don't keep doing it you'll ruin the throttle body or worse.

I did buy a new TPS at one point and the new one was bad, went to Napa and got a good one and the problem went away.

I still have a drive ability gremlin that surfaces and disappears and I'm going to drop the fuel tank next just been too busy.



Dave

[MYSTANGT]

Well oddly enough I drove the Jeep last night for about 30-40 minutes around town and I have opened it a few times and ... NOTHING!  Didn't pop, as a matter of fact it drove quite nicely...NOW i am confused...but guess what if its running well IM NOT TOUCHING A THING 

The only difference I can think of between two days ago and today is that last night i was alone and the other day i had 2 of my buddies with me, so maybe that extra load...but that seems very unlikely to me...

I'll keep driving it and shifting quick in high rpms and see what happens 

[sharpxmen]

Well oddly enough I drove the Jeep last night for about 30-40 minutes around town and I have opened it a few times and ... NOTHING!  Didn't pop, as a matter of fact it drove quite nicely...NOW i am confused...but guess what if its running well IM NOT TOUCHING A THING 

The only difference I can think of between two days ago and today is that last night i was alone and the other day i had 2 of my buddies with me, so maybe that extra load...but that seems very unlikely to me...

I'll keep driving it and shifting quick in high rpms and see what happens 

like i mentioned before, the fuel trims are readjusted the more you drive it as the computer (PCM) stores the new values. it takes 50 start/stop cycles to fully repopulate the PCM trims so it can be that driving it for 2 days helped - it will keep updating until the trims are down to acceptable levels - keep that in mind (it will get better in time). You can buy an OBDII interface if you want to monitor this on a laptop, it will show you the fuel trim correction values and you can see how they decrease in time.

[MYSTANGT]

Ok good.

I really hope that the Jeep is fine tuning itself into spec and that this was the problem.