Chris86 Posted October 10 Share Posted October 10 I have a 1986 jeep Comanche 2.5 engine throttle bottle truck and I get it in time perfectly but it always ends off 20 degrees can someone help me please Link to comment Share on other sites More sharing options...
eaglescout526 Posted October 10 Share Posted October 10 Wait. So you’ll set it where it needs to be, recheck it and find it off? Does it run when you find it off? Link to comment Share on other sites More sharing options...
Chris86 Posted October 21 Author Share Posted October 21 On 10/10/2025 at 10:00 AM, eaglescout526 said: Wait. So you’ll set it where it needs to be, recheck it and find it off? Does it run when you find it off? Link to comment Share on other sites More sharing options...
Chris86 Posted October 21 Author Share Posted October 21 Yes it runs just ideals rough and will reb up but soon as you go to pull out and put it under a load you loose it Link to comment Share on other sites More sharing options...
eaglescout526 Posted October 21 Share Posted October 21 Do your distributor have the hold down bracket? Link to comment Share on other sites More sharing options...
Chris86 Posted October 21 Author Share Posted October 21 Yes it does Link to comment Share on other sites More sharing options...
Chris86 Posted October 21 Author Share Posted October 21 I just don't understand the guy i bought from redone the engine I'm thinking hes got something out of time or something i even put a new distributor shaft and everything everyone was telling it was my shaft we its not the shaft Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted October 21 Share Posted October 21 If your distributor is actually turning maybe your oil pump is too tight. You can pull your distributor and use a long flat blade screw driver to check if it spins freely or not. Link to comment Share on other sites More sharing options...
Chris86 Posted October 22 Author Share Posted October 22 I believe I found the problem the guy before rebuilt the engine and after digging in deep in can not get the timing to line up the cam is always out I for thanking he used wrong dowel hole which when you switch it timing lines up perfectly but different size dowel holes I believe he got a camshaft for a carburetor motor or something I'm try to find a camshaft ive been trying to decode the motor number cause he switched motors from something else Link to comment Share on other sites More sharing options...
Chris86 Posted October 22 Author Share Posted October 22 When I align the camshaft sprocket with the other hole on the camshaft everything is in perfect timing but the hole doesn't align enough to get a dowel pin in idk what to do I'm stuck Link to comment Share on other sites More sharing options...
eaglescout526 Posted October 22 Share Posted October 22 Fun fact, carb 2.5Ls and TBI 2.5Ls use the same camshaft. I have heard though that Chinese made parts are really skipping on the whole alignment thing for timing. I know you’re saying the timing lines up but perhaps a pic of the two timing dots on the cam gear and crank gear to verify? Pics do go a long way for helping. Link to comment Share on other sites More sharing options...
Spinnakerblue89 Posted October 22 Share Posted October 22 I'm not entirely sure if this will help you, but it has helped me in the past with timing an engine. Sometimes the pulley's timing marks can be off, and even significantly. I have had an older vehicle where TDC on the pulley wasn't actually true TDC, and this I had to insert a pencil into the hole for cylinder #1, gently crank the pulley one direction until it stopped- mark the pulley at the indicator where it stops, and then go the reverse directly and repeat the same. Then at the center between those two marks would be true TDC. But your problem may not be that, it is only a suggestion. Link to comment Share on other sites More sharing options...
Chris86 Posted October 22 Author Share Posted October 22 I got ahold of the guy i bought it froms daughter she said she isn't forsure but he took the motor out of a jeep wrangler amd put in the Comanche ive got the engine number well both numbers on the engine i will add a pic of it but when I use the other dowel it makes complete turns and stays in time but soon as I put it back in the original dowel hole ut doesn't line back up I should have taken Pic of that I'm taking the cam to a machine shop that does head amd cam work the going to fix the other dowel hole so it will line up fully and I have pictures of the cam ive got it out now Link to comment Share on other sites More sharing options...
Chris86 Posted October 24 Author Share Posted October 24 Well have i said something to definf anyone Link to comment Share on other sites More sharing options...
eaglescout526 Posted October 24 Share Posted October 24 No. Just something like this does take time for one to wrap their head around. It’s odd that an engine swap was done and suddenly timing issues. Makes me wonder if the original owner was sold an engine that wasn’t working right to begin with. Have you tried looking up the casting info on the cam itself? Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted October 25 Share Posted October 25 On 10/22/2025 at 12:56 AM, Chris86 said: I got ahold of the guy i bought it froms daughter she said she isn't forsure but he took the motor out of a jeep wrangler amd put in the Comanche ive got the engine number well both numbers on the engine This engine block is a 2.5 liter and was made on May 23, 1995. So it is defiantly newer than your Comanche. That doesn't help with your timing issue but thought if you knew what year it was, it might help narrow things down if any internals changed between 86 and 95. Link to comment Share on other sites More sharing options...
eaglescout526 Posted October 25 Share Posted October 25 51 minutes ago, Eagle_SX4 said: if any internals changed between 86 and 95 I don’t recall much changing when I last had access to the digital catalog but I could very much be wrong. I know an 84-85 block is the same as well. I thought maybe my 84 2.5L had more pep since the TBI swap and had to check the cam. Cam is the same until 90. Actually, thinking about it. Maybe the HO is a little off on timing and perhaps the cam was changed and why it could be getting off on time as the lifter duration and timing could be different there. I wonder what the previous owner really did to that block. But I imagine there would be a lot more issues if this was the case like back firing. Link to comment Share on other sites More sharing options...
Chris86 Posted October 25 Author Share Posted October 25 Well I switched the cam sprocket dowel holes and put her back together in time and she started right up purring like a baby Link to comment Share on other sites More sharing options...
Chris86 Posted October 25 Author Share Posted October 25 Also after reading on the internal differences the camshaft it tells you got to switch camshaft or switch dowel hole but I'm picking up tools them going to see how she does under a load update soon Link to comment Share on other sites More sharing options...
eaglescout526 Posted October 25 Share Posted October 25 Glad the first part has been sorted! Link to comment Share on other sites More sharing options...
Chris86 Posted October 28 Author Share Posted October 28 Ok ive got a miss and ive been reading that the engine is a 95 jeep wrangler 2.5 tbi the thing is i can not get rid of the miss no matter what i do or replace everything i have read say the 95 distributor is different than the 86 the 95 has a cam sensor and wouldn't be firing exactly right is this true and also its show they should have used the tbi from the the 95 instead of using the tbi from 86 Link to comment Share on other sites More sharing options...
eaglescout526 Posted October 28 Share Posted October 28 24 minutes ago, Chris86 said: Ok ive got a miss and ive been reading that the engine is a 95 jeep wrangler 2.5 tbi the thing is i can not get rid of the miss no matter what i do or replace everything i have read say the 95 distributor is different than the 86 the 95 has a cam sensor and wouldn't be firing exactly right is this true and also its show they should have used the tbi from the the 95 instead of using the tbi from 86 Huh? 91-01 was MPFI. Little bit tougher to swap in than the TBI. However, yes. 91-01 distributors are different than 86-90. Link to comment Share on other sites More sharing options...
Chris86 Posted October 28 Author Share Posted October 28 Cause ive had nothing but trouble from this thing since ive gotten the one gentleman on here looked up the engine serial number and it came from a 95 jeep wrangler and the reason I done that was cause I couldn't get the timing to line up explains everything now though if noticed the wiring looked like it had been changed cause there's extra plugs here and there I'm going to look and see if there is a plug around the disturber cap Link to comment Share on other sites More sharing options...
Chris86 Posted October 28 Author Share Posted October 28 Cause the gentleman i got the truck apparently took a 95 jeep wrangler 2.5 tbi and stuck it in the 86 jeep Comanche and swap a few parts but done wrong so idk i guess ill try the 95 disturber and see Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted October 28 Share Posted October 28 15 minutes ago, Chris86 said: Cause the gentleman i got the truck apparently took a 95 jeep wrangler 2.5 tbi and stuck it in the 86 jeep Comanche and swap a few parts but done wrong so idk i guess ill try the 95 disturber and see As far as I know the 95 engine had MPFI (multi port fuel injection). The 86 had TBI (throttle body injection). If you still have throttle body injection it is likely that only the engine was changed and all of the original engine accessories were retained. Including manifolds and fuel and timing systems. Some more pics of the intake manifold and throttle body would be very helpful in determining what was changed or not. Also I realized I was wrong on the year of the engine. It is a 1985 engine which would mean it is likely original to the truck. The engine block casting number underneath the date code and kind of hard to see in the picture is 3239443 which was made between 83 and 88. That along with the date stamp leads to a 1985 engine block. I am very sorry for the confusion. The date code along is not enough info to correctly date an engine and I should have known that before I posted earlier. A 1995 distributor likely won't have the same connector and won't plug into your existing harness. Link to comment Share on other sites More sharing options...
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