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Would an engine tune up on a 2001 jeep cherokee sport increase idle rpm's?

Would an engine tune up on a 2001 jeep cherokee sport increase idle rpm's? Topic: Long computer case screws
July 24, 2019 / By Oralie
Question: my vehicle idles at around 550 to 600 rpms with the possibility of stalling (rarely, but happens, usually at normal operating temperature); IAC motor, battery, air filter has been changed; when ac/defrost compressor is on, rpms higher (approx. 700) with no threat of stalling
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Best Answers: Would an engine tune up on a 2001 jeep cherokee sport increase idle rpm's?

Maisie Maisie | 7 days ago
Couple of things that will screw up your idle. 1) the Idle Air Control (IAC) valve. This is a servo-motor operated air bypass valve that directly controls your idle RPM's. It is activated by the engine management computer and there is no way to manually adjust the idle RPM (as is the case in most modern computer controlled fuel injected engines). The IAC valve, and it's associated air passage cast into the throttle body, get clogged with deposits over time. As the passage clogs it restricts proper airflow to maintain a steady correct idle RPM. The remedy for this is to use some throttle body spray cleaner on it (this stuff is similar to carb cleaner but is much stronger so you don't need to use as much). You will need to remove the rubber accordian elbow that connects the air box to the throttle body. The actual passage is located on the side of the throttle body toward the valve cover. Flip open the throttle valve and look into the throat of the throttle body and you'll see a long rectangular slot. Squirt some cleaner into the slot. Also, with a toothbrush and the cleaner, scrub any deposits from the inside of the throttle body and the throttle valve. Again, go easy on the cleaner spray ...just use enough to get it clean. Now give the slot another shot and let it soak for a few minutes. Start the engine. It'll run rough until all the excess cleaner is drawn out. If it still runs rough or unstable at idle, try another dose of cleaner in the slot. If it just won't idle then it may be the IAC is too trashed and or the servo-motor has gone bad ....time to replace the IAC. But ...before you do that check .... 2) Vacuum hoses, connectors, plastic lines. If you have a vacuum leak in any of the few vacuum lines or a connector or plastic lines that make up the Crankcase Vent system (CCV) this can cause an erratic or improper idle RPM. If a hose looks cracked, dried or suspect, replace it. If the plastic lines are broken and leaking replace them (either with rubber hose or new plastic lines from the dealers parts department). I'm betting on the IAC as the culprit to your problems.
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We found more questions related to the topic: Long computer case screws


Maisie Originally Answered: Why did my 1999 Jeep Grand Cherokee engine shut off?
Do you have the 4.0 6-cylinder or the 4.7 V-8? It could be spark plugs, when was the last time you had them replaced? Spark plugs typically last around 100,000 miles. It could be a vacuum leak as well. If you lift the hood with the motor running do you hear a "air sucking noise" kind of like a vacuum sucking up air. A vacuum leak is usually just a loose hose. Another way to test for a vacuum leak is if your cruise control is working or not, no cruise control=vacuum leak. A great website to check out is the Jeep forum site. There is a ton of knowledge there, I have included the link to the Grand Cherokee forum below.
Maisie Originally Answered: Why did my 1999 Jeep Grand Cherokee engine shut off?
you're able to do some issues, take aside as many connections as you are able to and sparkling them or make confident they are sparkling, decrease than the hood and the alarm , make confident each and every little thing connects returned mutually stable, in case you will detect a thoroughly super dark place like in a storage with each and all the lights fixtures off, run the engine and seek for sparks around decrease than the hood and decrease than, do no longer fill the storage with exaust or you are able to circulate to sleep and not awaken, save your hands out of ways for any shifting areas, no loose cloths or jewlery, additionally you are able to circulate to autozone and have an electric powered verify and computing gadget checked for loose, make confident somebody follows you incase you decide on help,

Kiara Kiara
A full tune up would include adjustment of idle speed if the idle speed is out of range. Idle speed can be adjusted w/o a full tune up, but just speeding up idle out of range can cause other issues such as creep when stopped and in gear. If you have your work done by a mechanic, tell them about your concern. If you are doing your own work, consult a chilton manual (avail at part stores)
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Jaki Jaki
The way to bring your idle back into spec would be to have someone clean your throttle plates . They get gummed up and don't let enough air pass . Auto tech. 32 years
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Jaki Originally Answered: 2wd to 4wd jeep cherokee?
You will need a transfer case, front driveshaft, replace your front axle to one with a front differential and shift fork for engaging the 4wd. You'll need to cut a hole in the floorpan for the transfer case shifter. You will also need to plumb in all the vacuum lines and electrical wiring for the transfer case and front axle shift fork. Converting a 2WD to 4WD is a big job which requires a lot of time and some mechanical knowledge, but it can be done. Good luck on it.,

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