Difficulty starting when warm.

[Loco]

Recently I've been having trouble with the Sami (1.3 w/FI) after it has warmed up. After driving for a while (usually after high revs on the highway for as little as 15 mins) it will stall after slowing down (stop signs, parking lots, idle speed type stuff). After stalling it takes quite a bit of cranking before it eventually fires up (rough at first, then gets better after idling). Fires up first time every time when cold only seems to happen after running it for a while.
Any ideas?

 

[swhytie]

My XJ was doing that, was a dirty throttle body/idler sensor/intake manifold..I think it would suck in a little dust now and again would run really really rough had to play alot with the throttle to keep it idling, once i cleaned all the above mentioned out and reassembled it seemed to help havent had the issue since, even after 4 mud runs full throttle at the poltimore fair wich is when it would seem to choke up for me..after full throttle situations or high revs. Hope its a simple fix like mine was. Also had a buddy with a ram whos truck would cut out like that was pcv valve.

cheers

 

[DoctorPhate]

My XJ was doing that, was a dirty throttle body/idler sensor/intake manifold..I think it would suck in a little dust now and again would run really really rough had to play alot with the throttle to keep it idling, once i cleaned all the above mentioned out and reassembled it seemed to help havent had the issue since, even after 4 mud runs full throttle at the poltimore fair wich is when it would seem to choke up for me..after full throttle situations or high revs. Hope its a simple fix like mine was. Also had a buddy with a ram whos truck would cut out like that was pcv valve.

cheers

Thats what mine was too. I cleaned it all out with throttle body cleaner and sprayed it into the engine at full throttle a few times and shes better now.

 

[Baja]

My XJ was doing that, was a dirty throttle body/idler sensor/intake manifold..I think it would suck in a little dust now and again would run really really rough had to play alot with the throttle to keep it idling, once i cleaned all the above mentioned out and reassembled it seemed to help havent had the issue since, even after 4 mud runs full throttle at the poltimore fair wich is when it would seem to choke up for me..after full throttle situations or high revs. Hope its a simple fix like mine was. Also had a buddy with a ram whos truck would cut out like that was pcv valve.

cheers

MAP sensor or MAP sensor not getting enough vaccum is another cause. My YJ (with an XJ 4.0) used to do the same thing, after full throttle it would load up on fuel, stall and be hard to start. Turned out to be a cut in the vaccum line to the MAP sensor (the one on the firewall directly behind the valve cover)

 

[DoctorPhate]

MAP sensor or MAP sensor not getting enough vaccum is another cause. My YJ (with an XJ 4.0) used to do the same thing, after full throttle it would load up on fuel, stall and be hard to start. Turned out to be a cut in the vaccum line to the MAP sensor (the one on the firewall directly behind the valve cover)[/QUOTE]

Or on the throttle body on 97+

 

[Baja]

MAP sensor or MAP sensor not getting enough vaccum is another cause. My YJ (with an XJ 4.0) used to do the same thing, after full throttle it would load up on fuel, stall and be hard to start. Turned out to be a cut in the vaccum line to the MAP sensor (the one on the firewall directly behind the valve cover)[/QUOTE]

Or on the throttle body on 97+

Good call

 

[DoctorPhate]

Good call

Thanks, I was at the junk yard looking for them and noticed they werent on the firewall for 97+ so i followed the vaccum line and found it on the TB then looked it up and its actually mid 96 that they changed it. I guess it being up above there caused it to fail more often, something to do with valve cover heat.

 

[Loco]

Thanks for the input guys. I'll give the tb a good cleaning (can't hurt, right?!). I'll have a look at the vacuum lines too. :beer:

 

[DoctorPhate]

Thanks for the input guys. I'll give the tb a good cleaning (can't hurt, right?!). I'll have a look at the vacuum lines too. :beer:

Yup, take it completely apart and clean any sensors attached and see how that does.