Fuel consumption change after injector swap
#1
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Year: 1998
Engine: 4.0
Fuel consumption change after injector swap
Recently installed a set of 703's, filled the tank and reset trip meter to drive it through once this week out of curiosity on fuel economy vs before injector swap fuel economy.
Initially around town driving w/o using a/c fuel economy seemed to be doing better than before swap. However, the wife and I drove it over to Dallas last weekend (much to her chagrin. lol!) on the highway ~70-75 mph w/ a/c on and it really seemed to suck the fuel down noticeably. I was very surprised. I've only put ~ 200 miles on it and it's almost at 1/4 tank. That's well below what it was prior to swap.
Has anyone else experienced this after an injector swap? I don't seem to find any extensive data about it. If it's normal, I'm ok with it since it's not driven much at all. Just wondering...
Also, no codes, no cel's, no leaks, etc. Everything about it is meticulously maintained so I can't really find fault with any other parts of the systems and I'm very happy with the performance and how it runs.
Initially around town driving w/o using a/c fuel economy seemed to be doing better than before swap. However, the wife and I drove it over to Dallas last weekend (much to her chagrin. lol!) on the highway ~70-75 mph w/ a/c on and it really seemed to suck the fuel down noticeably. I was very surprised. I've only put ~ 200 miles on it and it's almost at 1/4 tank. That's well below what it was prior to swap.
Has anyone else experienced this after an injector swap? I don't seem to find any extensive data about it. If it's normal, I'm ok with it since it's not driven much at all. Just wondering...
Also, no codes, no cel's, no leaks, etc. Everything about it is meticulously maintained so I can't really find fault with any other parts of the systems and I'm very happy with the performance and how it runs.
Last edited by 4WD4EVER; 09-28-2015 at 10:48 PM. Reason: Add info
#2
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Year: 1999
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If its not a renix did you reset the computer and put it into quick learn more? It would tend to run rich i believe with the upgraded injectors without.
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#11
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Year: 1999
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People DO run 703's on renix engines. I don't know what the differences between 703's and 746's but I have read plenty of posts where people who switched to 746's from 703's and engines ran better.
#12
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Year: 1999
Model: Cherokee
Engine: 4.0L I6
Volvo injectors are better suited for renix years 87-90. 703 injectors perform better on 91-98 engines. Then the connectors changed, and they use 784's on 99-06 engines.
People DO run 703's on renix engines. I don't know what the differences between 703's and 746's but I have read plenty of posts where people who switched to 746's from 703's and engines ran better.
People DO run 703's on renix engines. I don't know what the differences between 703's and 746's but I have read plenty of posts where people who switched to 746's from 703's and engines ran better.
#15
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Year: 1998
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Thanks fellas, I'll look into it more. Like I said, I don't drive it much and I'm not concerned about fuel as much as performance and that part I'm satisfied with.