hogelectra Posted December 7, 2008 Share Posted December 7, 2008 Ok realize I live in Arizona and here getting cold is down in the 50's. I have had no running problems for weeks but now the temperature has started to drop I noticed that it runs real rough and hesitates at any speed. Any thoughts - 86 MJ 2.5L Need to add that earlier I did a complete tuneup. New plugs, emission devices, vacuum hoses. Cleaned all around the carb with cleaner. Almost foregot that I installed a new thermostat Did that the first thing - it was still hot and ran fine Link to comment Share on other sites More sharing options...
Randy in Maine Posted December 7, 2008 Share Posted December 7, 2008 If it were me, I would try rebuilding the carb paying careful attention on adjusting the choke correctly. I am not a carb guy though. Link to comment Share on other sites More sharing options...
Pete M Posted December 7, 2008 Share Posted December 7, 2008 The truck should have a TBI fuel injection, not a carb. Link to comment Share on other sites More sharing options...
Rockyrider367 Posted December 9, 2008 Share Posted December 9, 2008 yeah your motor would be a TBI setup. its the only way the 2.5l 4 cylinders came. hey and if someone knows why it does this mine does the same thing. :D but up here it just dropped to 3 degrese today and thats when it does it for me. Link to comment Share on other sites More sharing options...
Pete M Posted December 9, 2008 Share Posted December 9, 2008 Just to avoid confusion, export 2.5L trucks could be found with a carb, as well as the 84-85 2.5L XJs. Link to comment Share on other sites More sharing options...
Rockyrider367 Posted December 9, 2008 Share Posted December 9, 2008 ohh haha i did not know that. thats kinda cool though. Link to comment Share on other sites More sharing options...
manche Posted December 10, 2008 Share Posted December 10, 2008 i live in chandler ,az i have the same prob it runs rough now that its getting colder and my gas milage droped i think maybe i got a vacumm leak causing the gas prob cause i idle like 1000rpm Link to comment Share on other sites More sharing options...
hogelectra Posted December 15, 2008 Author Share Posted December 15, 2008 Here is what my research has shown me - still have problem - but have been researching what to look at. It seems the fuel injection system/Carb is not reaching an operating temperature or the system is not responding correctly to the cold. 1. The choke could not be staying closed long enough or at all. 2. The engine may not be reaching a working temperature - thermostat opening to soon 3. The fuel injectors could be bad If anyone else knows of a potential cause please add. My approach: 1. Check the thermostat first - it's easy. Pull it and put into some water and start heating it until it open and record the temperature of the water - my question what temperature thermostat is best? 2. I had already cleaned the whole area with carb cleaner - what I'll guess I'l do is see from the outside what indicates the choke is closed. Start the engine and watch what happens. 3. Now the injector - don't know what to do there except maybe replace it. Link to comment Share on other sites More sharing options...
hogelectra Posted December 15, 2008 Author Share Posted December 15, 2008 Here is what my research has shown me - still have problem - but have been researching what to look at. It seems the fuel injection system/Carb is not reaching an operating temperature or the system is not responding correctly to the cold. 1. The choke could not be staying closed long enough or at all. 2. The engine may not be reaching a working temperature - thermostat opening to soon 3. The fuel injectors could be bad If anyone else knows of a potential cause please add. My approach: 1. Check the thermostat first - it's easy. Pull it and put into some water and start heating it until it open and record the temperature of the water - my question what temperature thermostat is best? 2. I had already cleaned the whole area with carb cleaner - what I'll guess I'l do is see from the outside what indicates the choke is closed. Start the engine and watch what happens. 3. Now the injector - don't know what to do there except maybe replace it. Link to comment Share on other sites More sharing options...
hogelectra Posted December 17, 2008 Author Share Posted December 17, 2008 Looks like my current thermostat was 160 degrees. The OE was 195 degrees. Will put a new thermostat this weekend. This might be a positive path to better health Link to comment Share on other sites More sharing options...
hogelectra Posted December 20, 2008 Author Share Posted December 20, 2008 New 195 degree thermostat fixed the problem - runs great now Link to comment Share on other sites More sharing options...
Pete M Posted December 21, 2008 Share Posted December 21, 2008 :clapping: Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now