Hemi throttle body - clean or replace?? - Jeep Commander Forums: Jeep Commander Forum
Regular Service / Maintenance This section contains discussion about regular service and maintenance (upkeep) of your Jeep Commander

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post #1 of 9 (permalink) Old 10-26-2018, 05:17 PM Thread Starter
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Join Date: Jun 2017
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Hemi throttle body - clean or replace??

Hey, I’ve been having a surge at idle and then nearly stalling and a few times it did stall. I’ve been told that the TPS or IAC could be the culprit and that these are both built into the 5.7 TB and can’t be removed. Can anyone confirm this is the case?

On this point and A few months back I had my throttle body cleaned and doing some more research a few people have said that you should not manually clean a throttle body by pushing the ‘blade’ as Once u move the electronic throttle blade by hand on the electronic throttle bodies u knock it out of calibration and they never reset so idles hi. So basically you have to replace the TB rather than clean it for the 5.7.

Can anyone agree or disprove this? If the throttle body is removed before touching the blade is this ok?

Cheers

5.7 V8 Hemi!!!
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post #2 of 9 (permalink) Old 10-26-2018, 06:04 PM
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Did you disconnect the battery to see if it would reset?

I actually cleaned my throttle body in February and haven't had any problems at all. I didn't spray any cleaner directly on it, but just got a rag damp and scrubbed away while making sure I didn't let the blade slam shut or anything.

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post #3 of 9 (permalink) Old 10-26-2018, 10:01 PM
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The Hemi throttle body is a single unit; that means no replacing the TPS or anything else. It also means you have to be careful when cleaning it, since using cleaners too liberally can mess with the electronics.

There shouldn't be any problems moving the blade to clean it though. There is a recalibration method. I had similar problems initially when cleaning mine but after disconnecting and reconnecting the battery and running through the calibration mentioned I haven't had any problems.

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post #4 of 9 (permalink) Old 10-27-2018, 02:50 PM Thread Starter
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Join Date: Jun 2017
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Quote:
Originally Posted by Colt View Post
Did you disconnect the battery to see if it would reset?

I have disconnected the battery since for about 10 mins if that will work?

I actually cleaned my throttle body in February and haven't had any problems at all. I didn't spray any cleaner directly on it, but just got a rag damp and scrubbed away while making sure I didn't let the blade slam shut or anything.
Quote:
Originally Posted by consumedbywater View Post
The Hemi throttle body is a single unit; that means no replacing the TPS or anything else. It also means you have to be careful when cleaning it, since using cleaners too liberally can mess with the electronics.

There shouldn't be any problems moving the blade to clean it though. There is a recalibration method. I had similar problems initially when cleaning mine but after disconnecting and reconnecting the battery and running through the calibration mentioned I haven't had any problems.
Ok thanks, I’ll take a look at this cheers

I think with my surging at idle I’m going to replace the throttle body but good to know you can clean it and move the blade without worrying about breaking it or thinking calibration.

5.7 V8 Hemi!!!
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post #5 of 9 (permalink) Old 10-30-2018, 05:21 AM
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I cleaned mine with no problems, didn't realize there were things to watch out for. I did use brake cleaner instead of throttle body cleaner, read someplace that the throttle body cleaner can cause problems with the sensors. Used a ton of brake cleaner with no problem, after removing the throttle body. That was 20,000 miles ago.
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Had to replace the brakes - they opened more gas stations in town
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post #6 of 9 (permalink) Old 10-30-2018, 05:32 AM
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Quote:
Originally Posted by PhilCommanderPayne View Post
Ok thanks, I’ll take a look at this cheers

I think with my surging at idle I’m going to replace the throttle body but good to know you can clean it and move the blade without worrying about breaking it or thinking calibration.
There is also an air intake temperature sensor in the vicinity of the mass air meter which if it goes bad will cause surging/sputtering symptoms and will even cause the engine to stall. I would have that checked and make sure it is reading the proper air temperature.


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post #7 of 9 (permalink) Old 10-30-2018, 07:57 AM
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Join Date: May 2009
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Quote:
Originally Posted by Big Blue View Post
There is also an air intake temperature sensor in the vicinity of the mass air meter which if it goes bad will cause surging/sputtering symptoms and will even cause the engine to stall. I would have that checked and make sure it is reading the proper air temperature.
The air temp sensor on the hemi is in the intake air silencer - that big box by the radiator and above the fan.
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06 Commander Limited Hemi - QDII,
Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
Had to replace the brakes - they opened more gas stations in town
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post #8 of 9 (permalink) Old 11-01-2018, 10:35 AM Thread Starter
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Join Date: Jun 2017
Location: Oxfordshire
Own a Commander?: Yes
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Current Mileage: 114,000
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Quote:
Originally Posted by Big Blue View Post
There is also an air intake temperature sensor in the vicinity of the mass air meter which if it goes bad will cause surging/sputtering symptoms and will even cause the engine to stall. I would have that checked and make sure it is reading the proper air temperature.
Quote:
Originally Posted by rblapham View Post
The air temp sensor on the hemi is in the intake air silencer - that big box by the radiator and above the fan.
Thanks guys, just ordered a new throttle body, I did go with an eBay one (that another Uk Commander owner has used) so fingers crossed its good enough quality. I didn't want to spend 350 from the dealership!

Will check that sensor too Big Blue and also probably going to replace the EGR valve as done 116,000 miles so might as well as seems cheap and relatively easy to do.

5.7 V8 Hemi!!!
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post #9 of 9 (permalink) Old 11-12-2018, 03:17 PM Thread Starter
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Join Date: Jun 2017
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Current Mileage: 114,000
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[QUOTE=PhilCommanderPayne;533203]
Quote:
Originally Posted by Big Blue View Post
There is also an air intake temperature sensor in the vicinity of the mass air meter which if it goes bad will cause surging/sputtering symptoms and will even cause the engine to stall. I would have that checked and make sure it is reading the proper air temperature.]

Thanks guys, just ordered a new throttle body, I did go with an eBay one (that another Uk Commander owner has used) so fingers crossed its good enough quality. I didn't want to spend 350 from the dealership!

Will check that sensor too Big Blue and also probably going to replace the EGR valve as done 116,000 miles so might as well as seems cheap and relatively easy to do.
So new TB installed, mpg went up to 18 which for my Hemi is insane, has settled around 17mpg.

Unfortunately still getting the surging, although hasn’t stalled yet, not that it was stalling often before. Wonder if it takes a bit of time to settle in?

New egr valve purchased and going to do cam sensor too. Haven’t been able to check the air intake sensor yet.
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