4.0 help

[edhs125]

i have a 89 xj and i replaced the injectors. now when it is idleing the engine pulses. and i also got a sputter in low rpms and replaced almost everything. i have no idea what is causing these problems. can anyone help???

pm me
thanks

 

[J.C.]

First check your vacuum. Use a gauge and see if it's correct. If so, check your fuel pressure. Use a gauge and see if it's correct. Easy to pull one of the vacuum line loose during a fuel rail swap.

 

[jeepmkcomin]

Check aboved mentioned first... Idle air control I would think

 

[upnover]

Hmmm sounds familiar

Make sure the MAP sensor is hooked up

 

[edhs125]

bump

 

[willness33]

Check aboved mentioned first... Idle air control I would think

Agreed. Those sound like IAC problems to me.

bump

Have you changed the IAC or attempted to clean it yet?

 

[302cj]

This will sound stupid but have you disconnected the hot side of the battery to let the computer reset?

 

[edhs125]

bump

 

[willness33]

bump

Have you changed the IAC or attempted to clean it yet?

I'll be more than happy to give you more ideas, but I need to know what you've done to the damn thing so far.