MeanLemons Posted May 15, 2018 Share Posted May 15, 2018 I had my hands on so many throttle bodies over the years. Probably over 200 of them. AND I just recently actually noticed this.... for 91-95 HO engines. There’s two types of throttle bodies and I can’t figure out why there is a difference. Theres the smooth and the ribbed. (No I'm not talking about condoms lol. I’m wondering why there’s a difference? Perhaps it’s early HO such as 91-92 then there’s 93-95? (I just came up with the numbers). Or is it a vehicle specific? Such as XJ/MJ? Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 15, 2018 Share Posted May 15, 2018 One difference is the throttle body mounting for the MAP sensors on the newer ones. Link to comment Share on other sites More sharing options...
MeanLemons Posted May 15, 2018 Author Share Posted May 15, 2018 1 minute ago, HOrnbrod said: One difference is the throttle body mounting for the MAP sensors on the newer ones. That’s right I mean I knew that 96-04 had same TBs with MAP mount on the side. its the two different 91-95 TBs that had me wondering why one is smooth and another is ribbed. Link to comment Share on other sites More sharing options...
AeroNautical Posted May 15, 2018 Share Posted May 15, 2018 It almost looks like a heat sync, to cool the air as it's venturied into the intake manifold. Thats ridiculous though, it probably has something to do with strength. Link to comment Share on other sites More sharing options...
MeanLemons Posted May 15, 2018 Author Share Posted May 15, 2018 5 minutes ago, PFCLeist said: It almost looks like a heat sync, to cool the air as it's venturied into the intake manifold. Thats ridiculous though, it probably has something to do with strength. Right. I wanted to know why it changed and when was the change taken effect. On what years and what jeep model. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 15, 2018 Share Posted May 15, 2018 That is strange. Just for grins I looked in the parts manual, and the XJ/MJ 91-95 4.0 engine throttle bodies all carry the same p/n, 53030844. It changed in 96 due to the MAP mount. Link to comment Share on other sites More sharing options...
Jeep Driver Posted May 15, 2018 Share Posted May 15, 2018 Chrysler probably changed vendors Two different vendors two different designs Link to comment Share on other sites More sharing options...
MeanLemons Posted May 15, 2018 Author Share Posted May 15, 2018 Out of 4 throttle bodies I had. (One ribbed 91-95, two smooth 91-95, and one 96+) they all had different numbers stamped on the bottom even between two identical smooth 91-95 TBs. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 15, 2018 Share Posted May 15, 2018 They look like casting numbers... Link to comment Share on other sites More sharing options...
Pete M Posted May 15, 2018 Share Posted May 15, 2018 the ribbing could be for strength. seems unlikely they would be for cooling since the ambient air in the engine bay is wicked hot. Link to comment Share on other sites More sharing options...
MeanLemons Posted May 15, 2018 Author Share Posted May 15, 2018 9 minutes ago, HOrnbrod said: They look like casting numbers... Indeed I also noticed that those smooth TBs doesn’t have mopar part numbers on the IAC housings. Makes me wonder if they were aftermarket replacements? Link to comment Share on other sites More sharing options...
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