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Jeep Wrangler YJ
YJ General Discussion
Need some help with 91 YJ engine codes 75 and 73
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<blockquote data-quote="c_anthony27" data-source="post: 428266" data-attributes="member: 19328"><p>I have a ‘91 YJ with an auto trans </p><p></p><p>Recently did an engine swap</p><p>Jeep has 109k miles on it</p><p>new engine came out of a good running 90k miles Jeep</p><p>Engine came out of a ‘92 </p><p></p><p>When driving it around town it runs fine </p><p>I am noticing that when you give it more than half throttle its not that responsive </p><p>On the the highway when you floor it </p><p>it does engage the trans kickdown</p><p>but it struggles getting up past 50 </p><p>It has 31” tires on it </p><p></p><p>I have 3 other jeeps with 4.0 engines including a TJ with 33” tires </p><p>none of them are as slow to accelerate as this one is. </p><p></p><p>So i did the engine light code check thinking maybe its a map sense or tps sensor </p><p></p><p>I am getting codes in this order </p><p>12</p><p>75</p><p>73</p><p>35</p><p>55</p><p></p><p>I cant find 75 and 73 anywhere online for descriptions of them. </p><p></p><p>Anyone have any suggestions on where to start ?</p><p></p><p>I also just changed the fuel filter about 25 miles ago</p><p></p><p>and the trans is not slipping </p><p>it shifts firmly in to every gear</p></blockquote><p></p>
[QUOTE="c_anthony27, post: 428266, member: 19328"] I have a ‘91 YJ with an auto trans Recently did an engine swap Jeep has 109k miles on it new engine came out of a good running 90k miles Jeep Engine came out of a ‘92 When driving it around town it runs fine I am noticing that when you give it more than half throttle its not that responsive On the the highway when you floor it it does engage the trans kickdown but it struggles getting up past 50 It has 31” tires on it I have 3 other jeeps with 4.0 engines including a TJ with 33” tires none of them are as slow to accelerate as this one is. So i did the engine light code check thinking maybe its a map sense or tps sensor I am getting codes in this order 12 75 73 35 55 I cant find 75 and 73 anywhere online for descriptions of them. Anyone have any suggestions on where to start ? I also just changed the fuel filter about 25 miles ago and the trans is not slipping it shifts firmly in to every gear [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Need some help with 91 YJ engine codes 75 and 73
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