Why is my Jeep hesitating?

[Brett]

Okay, when it's nice and chilly out, my Jeep likes to hesitate when I am accelerating. It feels like it almost shudders, like it's not getting enough air or fuel...? Thought maybe it was slipping on the tranny the first time, but I know what that feels like and it's not that. What sensors am I going to be replacing this time? It's fine once it's warmed up enough to get above the 100 degree mark on my gauge. Kind of weird to me!

89 Cherokee 4.0 Auto

 

[JoeT]

Last time that you used some really good F.I. cleaner was .........

 

[Brett]

Last time that you used some really good F.I. cleaner was .........

Never, cause on my last Jeep when I used that, every single injector started leaking

 

[Brett]

Forgot to mention that it idles odd now and then. Runs nice and smooth around 800 (seems higher than normal to me) and then suddenly it'll drop down about 75-100 RPM's and runs a bit rougher, almost like it's missing...???

 

[BioNuke1]

If you check engine light is on maybe get it scanned and see if any of your sensors are crap.

 

[Brett]

If you check engine light is on maybe get it scanned and see if any of your sensors are crap.

No check engine light on this baby, that's only the California models. This is pre OBD-1 here so no scanning either! :greg:

Come on Jeep people! I'm thinking that my IAC is going bad on me.

 

[Caleb]

it could be the IAC but have you checked the simple things? plugs wires rotor and cap? where you say it sounds like its missing or something I would look at spark first before air, then fuel delivery, then air

 

[Hickey]

Never, cause on my last Jeep when I used that, every single injector started leaking

Same thing happened to me. Check your plug wires.

 

[Brett]

Same thing happened to me. Check your plug wires.

Well, if it's plug wires (and I am not checking right now) why would it run fine when it warms up?

 

[Hickey]

Well, if it's plug wires (and I am not checking right now) why would it run fine when it warms up?

Ya got me. My mom had a hesitation like you described. Turned out to be a broken plug wire.

 

[Brett]

Ya got me. My mom had a hesitation like you described. Turned out to be a broken plug wire.

I'm not really sure what to say to that. How'd you fix her broken plug wire?

 

[Hickey]

She took it in to the dealer. They changed ONE plug wire. How stupid is that?

 

[Brett]

She took it in to the dealer. They changed ONE plug wire. How stupid is that?

Thought your mom had a hesitation

 

[Hickey]

Thought your mom had a hesitation

 

[tacomatrd]

I always hesitated until you got me warmed up too. Maybe your Jeep requires more foreplay.

 

[Brett]

I always hesitated until you got me warmed up too. Maybe your Jeep requires more foreplay.

lies

 

[Hickey]

lies

Can't be. I read it on the internet.

 

[ace]

Sounds like your fuel pump could be quitting. I guess fuel pump.

 

[Brett]

Can't be. I read it on the internet.

She was always warm and willing

 

[tacomatrd]

Can't be. I read it on the internet.

Tis all true. I have witnesses who are willing to sign sworn affadavits and give legally binding testimony in court.