5.3 issue

[roll over dave]

Motor has been in for a lil while just got exshuast done ran fine till then now truck has a bad miss and smokin bad check engine light is on ran it on scanner says. O2 bank 1 -and 2 will o2 cuase it to do this 5.3 painless harness also said knock sensor

 

[30th6]

Re: Re: 5.3 issue

I've burned the o2 harness on headers before and I barely got it home it was flooding so bad.so o2 can make it flood out enough to make it miss.

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[roll over dave]

That sounds like wts goin on jjst got worse all of a sudden it started with a stutter at low rpm now all the way through

 

[TOYTOACRAWLERS]

put a good tune in it and turn the knock sensors and o2s off the hitman runs flawlessly this way

 

[wannabe]

if it runs good cold then gets bad when hot it could be the O2's. on start up the ECM uses sensors like temp and knock sensors to judge fuel control, then switches over to O2's at higher ttemps.. closed loop and open loop sir!

 

[doctordick]

put a good tune in it and turn the knock sensors and o2s off the hitman runs flawlessly this way

With the knock sensor and 02 sensors off, the ecm is in a very conservative fixed timing and fuel curve. You're not getting near the performance that you should from that engine.

 

[roll over dave]

Its not smokin anymore thought could been water in tank drained it replaced not smokin now but stutter while its cold and hot if crank sensor is bad it wouldnt crank right what i read online?

 

[liv2mx]

clean the injectors.

 

[roll over dave]

I cleaned them when motor was put in there all firing it idels fine just when givin gas i am goin pug bottle of sea foam in tank and clean mass air flow this evening

 

[wannabe]

does it have an OBD2 port? might check TP and APP corelation

 

[Lickliter21]

My mass air flow has been giving me problems after a roll over. Runs better unhooked. Might be somthing to try.
Gonna replace mine tonight hope it fixes my stumbling issue.
Check the temp sensor too. They run real bad if its not working. (Front left head)

 

[bjeep]

Check fuel pressure. Had one that would idle fine but would miss when reving
on it. Fuel pump was not making enough volume to keep up.

 

[roll over dave]

Fuel pressure is good and mass air flow checked it will check temp sensor also thanks