Question about 1999 Jeep Grand Cherokee
Most cars , not all, and not all engines ,it can be 2 valves.
you never stated which engine option, (90% never do)
3.7L or 4.0L I6) 4.7L? each has its own EFI design.
so Icant be exact , at all
but ill answer in generic (im an idle expert)
first off, idle will be the last thing to work right on all EFI based engines
(its like balancing a broom on nose) (ask why)
there are traditionally (but not on newer smarter ECUs)
1: a pure water temp fast idle cold, valve, working exactly like
the RAD/block thermostat with wax pellet. IAC
2: the Electric valve i call ISC and is a slave to the ECU.
the ecu forms a idle control servo closed loop.
now ill look yours up, with engine guess.
i think, in 2001 there are only 1 IAC. (ISC)
its on the 4L TB, ive cleaned mine like 100 times, in 25 years ( 3 jeeps and 4 jabs jeeps)
they all stick and for the same reasons.
i make a joke of the EGR cloud, smacking into the PVC CLOUD.
creating GUNK, that causes all ISC to stick,
even my new car.
what i did to my 88 horror jeep was clean it.
the ISC CONE, with carb cleaner
then spray it with my magic Russian gun lube. good to -55c.
looks like tefon frying pan coating, after.
this was a new perfect cure. and a SECRET, ive never told.
88,99,02 jeeps, 91,96,97.04 jab jeeps,(Vitara\'s)
the EGR ,same deal
ask me for help with any idle problem.
there are many causes.
13 ways, here. (applies to all EFI gas )
what\'s the symtoms, hot or cold?
Posted on Dec 27, 2013
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Posted on Jan 02, 2017
SOURCE: 2002 jeep cherokee laredo
the only problem that vehicle has is with cooling fans is relay/module or electrical harness to module that burns up located behind and under right front headlamp assy must remove headlamp to access relay/module that is what powers up fan motor module assy.
Posted on Aug 10, 2008
Fuse # 20, located in the Junction Block (interior, drivers side). This is a ten amp fuse.
Read the information at the above site. The TSB (technical service bulletin) may be of interest to you.
Posted on Nov 20, 2008
SOURCE: Heater blows cold air when idle
Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.
Posted on Jan 03, 2009
hello, this sounds like a bad blower motor resistor!! its cheap and easy to change..if you need more info on locations let me know,, good luck.....marty
Posted on May 27, 2009
I had the exact same problem on my 04 GC. I put some Techron Concentrate Plus Fuel System Cleaner in from Wal-Mart and it seemed to fix the problems right away. Let me know.
Posted on Jun 01, 2009
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