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Old 10-15-2013, 10:07 PM   #1
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82 Cj running rich!

I have an 82 CJ7 with a rebuilt 305 fuel injection. It's been running rich. I/we have tried a few things to fix the problem but have been unsuccessful. Fuel filter, fuel pump pressure, timing and computer are working as they should. What we did realize is that the throttle body is off a 350 and not a 305. Did some reading and found that the fuel injectors for a 350 put out a higher pressure per hour compared to a 305. I believe I have found a 305 throttle body to install but all the gaskets and diaphragm need to be replaced. My question is am I going down the right path here? I'm going to have to rebuilt the 305 throttle body and hope that it works. I'm trying to save some money and time. Its been frustrating. I'm on the verge of converting to a carburetor. Any help or pointers would be appreciated.

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Old 10-16-2013, 08:17 AM   #2
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I am not a fuel injection expert but what you are saying makes sense to me

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Old 10-16-2013, 12:58 PM   #3
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Yes use the 305 throttle body and injectors. Not much is going on in the throttle body. The fuel pressure regulator is in there and the base gasket. Remember o2 sensor position is vital on the older TBI systems. It needs to be close to the engine. If you are running factory style exhaust manifolds you should be fine. If the sensor is 2 feet away from the engine cause you have headers it will not warm up enough to work right. I would give more effort to the TBI. TBI is better all around than a carb. make sure you are running a factory temp thermostat also. The engine needs to be all the way warmed up to go into closed loop. I have learned to always start with the obvious things that are wrong, like you noticed the incorrect throttle body/injectors and go from there.
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Old 10-17-2013, 10:54 AM   #4
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Thanx MTJeep. We put an O2 sensor in a week ago. It's about 1-2' from the block just after where the exhaust bends and heads straight back.
I've checked a few places to buy the TBI rebuild kit with no luck. I have to do some more searching. When I get the job done I will respond back with any progress. Fingers crossed! Thanx again for the insight.
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Old 10-17-2013, 01:56 PM   #5
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If your o2 sensor is a single wire sensor it is not heated by itself. It has to be warmed up to temp by the exhaust. If you look at where they were on the TBI systems stock they are right at the outlet by the engine. The sensor needs to be HOT to start switching back and forth and hit closed loop. The o2 sensor reads the air/fuel ratio in the exhaust and switches constantly back and forth to adjust rich/lean. I would just get a new base gasket for your 305 throttle body and maybe a new fuel pressure regulator and run it. Hit up your local parts place and see what they have for gaskets and the regulator. Maybe do the injector seals if they have them. Its pretty simple in the throttle body. The idle air control motor is on the throttle body also but shouldnt need anything.
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Old 10-17-2013, 08:54 PM   #6
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Yeah the O2 sensor is a single wire. We ran the motor with a computer connected so we could watch the temp. I believe the O2 sensor starts reading at 150F. Don't remember exactly.
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Old 10-17-2013, 09:11 PM   #7
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I see what your saying about the sensor though. It may not be close enough to the exhaust ports to get hot enough.
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Old 10-17-2013, 09:50 PM   #8
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Never mind about the 150F. I think it was a much higher temp.

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