Code 27 (fuel injection circuit)
#1
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Year: 1995
Model: Cherokee
Engine: 4.0 HO
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So a few weeks ago, I started up and it was running rough (sounded as if it were only running on five cylinders) and saw my CEL come on. I drove it home and it ran and idled fine. When I got home, I checked the code and saw that it was 27. The next time I started back up (hours later),no CEL. I have not had a single CEL since then. Yesterday, after a few errands and sitting for a few hours, it happened again. This time I shut it down and started again and it went away. What could be causing a very intermittent code? Possibly dirty fuel lines?
#3
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Year: 1995
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Me too... so you're saying fuel injectors go bad? Or it could just be debris the line? I haven't done anything (tampered with) to my fuel lines, injectors or wiring. It has only happened twice in the last two months, out of nowhere.
#5
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Year: 1996
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I have a 95 myself and had fuel injector issues. At first it was very intermittent like what you're describing. Then before you knew it every time I started her up she ran like complete crap. Here's the thread I created a while back: https://www.cherokeeforum.com/f67/70...poorly-159673/
In short, you can check your injectors continuity with a multimeter. Check each injector. No special tools are required to disconnect the injectors on a 95. However, if your issues are intermittent, I'd imagine the continuity might show good on the bad injector if it's not acting up when you test. If one or more are clogged, I think they'll pass the continuity test but code 27 will still be thrown. I'm not certain about that though.
It wouldn't be a bad idea to pull them out and give the ports a good cleaning. Mine were really gunked up. I did an injector upgrade while I was at it and it was definitely worth it. Just don't go with the Ford injectors! I had nothing but issues with those if you do decide to upgrade.
This link is to the writeup on how to do the swap. It's worth a read because the author describes how to remove the injectors and how to clean up the ports.
In short, you can check your injectors continuity with a multimeter. Check each injector. No special tools are required to disconnect the injectors on a 95. However, if your issues are intermittent, I'd imagine the continuity might show good on the bad injector if it's not acting up when you test. If one or more are clogged, I think they'll pass the continuity test but code 27 will still be thrown. I'm not certain about that though.
It wouldn't be a bad idea to pull them out and give the ports a good cleaning. Mine were really gunked up. I did an injector upgrade while I was at it and it was definitely worth it. Just don't go with the Ford injectors! I had nothing but issues with those if you do decide to upgrade.
This link is to the writeup on how to do the swap. It's worth a read because the author describes how to remove the injectors and how to clean up the ports.
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makros (01-30-2024)
#6
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Year: 1995
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My 1995 XJ has the check-engine light on continuously with that code for a few weeks now. I can't say I notice it running any worse than normal. (I kid: the leaky exhaust is a distraction.)
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