clear the codes, let the check engine light return, and re-read them - and repost. Or, you could buy your own $35 scanner, which for engine misfire diagnosis, can be priceless.

If you still have misfires, its time to look elsewhere...maybe 02 sensors, who knows. Codes are your friend now, you just need to use a little sluething skills about what they are telling you now.

 

Is this what you are experiencing now http://www.thelurch.com/lurching_zf_transmission.htm

 

Just thinking out loud here.

Back when I took Joyces Jags intake manifold off, I had problems removing the brake booster vacuum line at the backside of the intake. When I reinstalled the brake vacuum line to the intake I had a small vacuum leak, it did NOT throw codes but Joyces tranny all of a sudden developed a "lurching sensation" especially when I came to a complete stop. I replaced the quick connect at the back of the intake for the brake vacuum line and immediately the "lurch sensation" disappeared.

A $6.00 dollar part saved a $4,000.00 transmission job.

Just food for thought.

 

Now that is great information. Thanks!

 

Rick - great picture and info!

Er, I know I don't have that engine but do you have another pic taken a bit further away to orient where it is to anyone who's a bit unfamiliar with what goes where?

Were you able to tell from fuel trims that there was an air leak? Also, could you hear any hissing at all?

 

I know nothing about these transmissions, but I wonder is there a vacuum controlled shift control solenoid on these?
I know from past experiences vacuum has alot to do with transmissions shifting.

 

I have another of the intake on the work bench but I can't find it. This picture is of the backside (firewall) of intake manifold. Notice the oil pooled in the lower IMT orifice.

There were no fuel rail problems or loud hissing sounds. I had another "educated guess" that I messed up the fitting when I removed the vacuum line. So I started there, I reached behind the intake manifold while engine was running and barely moved the vacuum line and then the loud hissing was heard. To temporarily "fix vacuum leak" I wrapped electrical tape around it until I replaced the quick connect after the weekend.

With the recent "transmission jerk" threads, Between Joyces Jag and more recently Joels vehicle the engine (vacuum leaks) were causing the tranny faults!

 

Not sure how to put it HERE like Rick does...

 

Btw, there is another vacuum quick-connect on the front of the manifold, also prone to damage upon removal.

 

Thanks Zane for the bench top pic

 

this is exactly what I am trying to fix Gus on my Xjr the brake booster line that goes into block seems to have alot of play.

I am figuring the line looks good its just loose do I replace the oring ?


what is the part number by chance?

just so you know I am referring to the pic on top with the arrow.if i pull the line a little bit the seal isnt flush with the manifold i can clearly see the brass looking finish.