Macrbailey Posted December 31, 2024 Share Posted December 31, 2024 I bought a 1991 Comancher 2WD, 2.5L a couple months ago. When purchased it would start and sometimes kick off. PO said he though it needed a new radiator as it would overheat. Fixed the overheating issue and went about chasing a low oil pressure dummy light. When I took off the rocker cover it was super dirty and full of crud. Cleaned that out and dropped the oil pan to clean up the pan and the oil pickup tube. Since putting everything back together I can't get the jeep to turn over. I have verified pressure in the fuel rail and can hear the pump kick on when I turn the key. I have verified spark. When turning the key the engine will crank but will not turn over. Any advice, ideas, or help would be greatly appreciated. Link to comment Share on other sites More sharing options...
89 MJ Posted January 1 Share Posted January 1 Is the gas still good? Let me get this straight, the engine turns, but it won’t fire and run, correct? Link to comment Share on other sites More sharing options...
pizzaman09 Posted January 1 Share Posted January 1 If you had the valve cover off, did you bump a connection to a sensor like MAP sensor? Link to comment Share on other sites More sharing options...
Macrbailey Posted January 1 Author Share Posted January 1 On 1/1/2025 at 1:13 AM, 89 MJ said: Is the gas still good? Let me get this straight, the engine turns, but it won’t fire and Expand The gas is still good, before it stopped running I was able to put fresh gas in it. And correct it will turn but not fire and run Link to comment Share on other sites More sharing options...
Macrbailey Posted January 1 Author Share Posted January 1 On 1/1/2025 at 1:43 AM, pizzaman09 said: If you had the valve cover off, did you bump a connection to a sensor like MAP sensor? Expand MAP sensor is still on tight Link to comment Share on other sites More sharing options...
pizzaman09 Posted January 1 Share Posted January 1 I'm trying to understand, what do you mean by it cranks but won't turn over? Link to comment Share on other sites More sharing options...
Macrbailey Posted January 1 Author Share Posted January 1 On 1/1/2025 at 4:49 PM, pizzaman09 said: I'm trying to understand, what do you mean by it cranks but won't turn over? Expand I'm sorry i guess I said that wrong. When turning the key it'll crank and engine will rotate but won't start Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 1 Share Posted January 1 91 would make this an HO. Check engine light on? I know this system still has the CPS on the bell like Renix. I dont much but about 2.5L HO to help out further but to me I would think CPS. Link to comment Share on other sites More sharing options...
Macrbailey Posted January 1 Author Share Posted January 1 On 1/1/2025 at 5:41 PM, eaglescout526 said: 91 would make this an HO. Check engine light on? I know this system still has the CPS on the bell like Renix. I don't much but about 2.5L HO to help out further but to me I would think CPS. Expand No check engine light on, I have ordered a CPS and will see if that fixes it when it comes in Link to comment Share on other sites More sharing options...
fiatslug87 Posted January 1 Share Posted January 1 Spray some starting fluid in the intake hose and see if it fires up then dies. This would indicate a fuel problem. Link to comment Share on other sites More sharing options...
89 MJ Posted January 1 Share Posted January 1 Are you sure the timing and firing order are correct? Link to comment Share on other sites More sharing options...
Macrbailey Posted January 1 Author Share Posted January 1 On 1/1/2025 at 9:01 PM, fiatslug87 said: Spray some starting fluid in the intake hose and see if it fires up then dies. This would indicate a fuel problem. Expand I've tried starting fluid and it didn't change anything Link to comment Share on other sites More sharing options...
Macrbailey Posted January 1 Author Share Posted January 1 On 1/1/2025 at 10:00 PM, 89 MJ said: Are you sure the timing and firing order are correct? Expand How would a verify that? Link to comment Share on other sites More sharing options...
89 MJ Posted January 1 Share Posted January 1 The firing order should be somewhere on the intake. To set the timing, make sure the rotor is pointed at the #1 terminal of the distributor cap when cylinder 1 is at TDC of the compression stroke. Link to comment Share on other sites More sharing options...
JYau Posted January 3 Share Posted January 3 Funny thing, I had just recently installed a new thermostat housing gasket as the old one was leaking a bit. When I went to go fire it up for the first time after the new gasket it didn't start. I was very puzzled because that was the only thing I touched. First thing that I check is the CPS and sure enough it was bad. Ordered a new CPS and it fired right up. Strange coincidence, it almost sent me down a wild goose chase. Link to comment Share on other sites More sharing options...
AZJeff Posted January 3 Share Posted January 3 On 1/1/2025 at 10:00 PM, 89 MJ said: Are you sure the timing and firing order are correct? Expand The firing order on EVERY straight six in the entire WORLD is 1-5-3-6-2-4. unless the distributor is loose and turns, timing shouldn’t ever go out of wack Link to comment Share on other sites More sharing options...
pizzaman09 Posted January 4 Share Posted January 4 On 1/3/2025 at 10:31 PM, AZJeff said: The firing order on EVERY straight six in the entire WORLD is 1-5-3-6-2-4. unless the distributor is loose and turns, timing shouldn’t ever go out of wack Expand Almost true. Old Jags were numbered with #6 at the front and #1 at the bulkhead. Thus causing much confusion for people in timing them. Link to comment Share on other sites More sharing options...
89 MJ Posted January 4 Share Posted January 4 On 1/3/2025 at 10:31 PM, AZJeff said: The firing order on EVERY straight six in the entire WORLD is 1-5-3-6-2-4. unless the distributor is loose and turns, timing shouldn’t ever go out of wack Expand I was thinking maybe a couple of spark plug wires got switched if any plugs were pulled for any reason Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 4 Share Posted January 4 On 1/3/2025 at 10:31 PM, AZJeff said: The firing order on EVERY straight six in the entire WORLD is 1-5-3-6-2-4. unless the distributor is loose and turns, timing shouldn’t ever go out of wack Expand On 1/4/2025 at 2:30 AM, pizzaman09 said: Almost true. Old Jags were numbered with #6 at the front and #1 at the bulkhead. Thus causing much confusion for people in timing them. Expand On 1/4/2025 at 3:34 AM, 89 MJ said: I was thinking maybe a couple of spark plug wires got switched if any plugs were pulled for any reason Expand Hey goofballs. He’s got a 4cyl. Link to comment Share on other sites More sharing options...
89 MJ Posted January 4 Share Posted January 4 On 1/4/2025 at 3:43 AM, eaglescout526 said: Hey goofballs. He’s got a 4cyl. Expand Lmao, do you really expect me to read? I still stand by two spark plug wires possibly being swapped Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 4 Share Posted January 4 On 1/4/2025 at 3:49 AM, 89 MJ said: Lmao, do you really expect me to read? I still stand by two spark plug wires possibly being swapped Expand Lol. Yes. Its reading very vital to helping others on here. Link to comment Share on other sites More sharing options...
jdog Posted January 4 Share Posted January 4 Did you mess with the rockets or the push rods at all? This should have the injectors, did you pull any of those plugs? Did you pull the distributor out? Something is amiss what all did you touch when you did the pan and the rocker cover? Link to comment Share on other sites More sharing options...
AZJeff Posted January 4 Share Posted January 4 On 1/4/2025 at 3:43 AM, eaglescout526 said: Hey goofballs. He’s got a 4cyl. Expand I checked before I posted to be sure it was not a 2.5L. I guess I did not check carefully enough Link to comment Share on other sites More sharing options...
AZJeff Posted January 4 Share Posted January 4 On 1/4/2025 at 2:30 AM, pizzaman09 said: Almost true. Old Jags were numbered with #6 at the front and #1 at the bulkhead. Thus causing much confusion for people in timing them. Expand That’s interesting. I owned an E-type at one time, and don’t know if it applied to that model or not. Leave it to the English to go their own way with things automotive.🥴 Link to comment Share on other sites More sharing options...
Ωhm Posted January 4 Share Posted January 4 From Wikipedia: Link to comment Share on other sites More sharing options...
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