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  #1  
Old December 2nd, 2019, 18:56
97xj_bandwagon 97xj_bandwagon is offline
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Engine swap, Have spark, fuel, and timing, Crank No Start

1997 Jeep xj sport 4.0. Iíve run out of ideas. Had a piston explode in my old motor so I swapped in a block and kept my old head and all accessories including the distributor. Messed with the timing for a while and finally got it to where I believe itís suppose to be (right after 1 position on tdc compression stroke). Has good blue snapping spark and good fuel pressure. I did a noid light test and can smell fuel after cranking. Replaced crank sensor, tps, ignition coil, rotor button, spark plugs, and the head. No fuses are blown. Has strong crank and sounds like it wants to start but wonít. Any advice?
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  #2  
Old December 2nd, 2019, 20:34
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

usually the distributor is off, did you install this with a punch? been here before lol and i thought i had it right.

are all the plug wires in the right place, and fuel injection plugs?

do you know the valve head is in good condition?

you could try starting in flood mode if you think everything else is good. pedal to the floor and crank to clear the block.

its always the little things that getcha at this point haha
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  #3  
Old December 2nd, 2019, 20:37
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4x4JeePmaNthINg 4x4JeePmaNthINg is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

also how did you test to see if you were at TDC compression stroke?
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  #4  
Old December 2nd, 2019, 20:46
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techno1154 techno1154 is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

Quote:
Originally Posted by 4x4JeePmaNthINg View Post
also how did you test to see if you were at TDC compression stroke?
Is the distributor set to cylinder #1 or #6? I have been a mechanic since the early 1970's. Two years ago I set the distributor in my XJ to cylinder 6 i.e. cylinder 6 was ready to fire but the distributor fired cylinder 1. I dam near tear the entire 4.0 apart in an effort to find why it would not start.
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1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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  #5  
Old December 2nd, 2019, 21:10
97xj_bandwagon 97xj_bandwagon is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

Quote:
Originally Posted by 4x4JeePmaNthINg View Post
usually the distributor is off, did you install this with a punch? been here before lol and i thought i had it right.

are all the plug wires in the right place, and fuel injection plugs?

do you know the valve head is in good condition?

you could try starting in flood mode if you think everything else is good. pedal to the floor and crank to clear the block.

its always the little things that getcha at this point haha
I did the punch trick. With the oil pump line thing at 11 oíclock, I positioned the hold down bracket at 1 oíclock and it would end up slightly past the bolt hole in the block. I tried multiple times to get it to line up perfectly with the hole but it was always ending up slightly past it so I would take the punch out twist the distributor to line up with the bolt hole.
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  #6  
Old December 2nd, 2019, 21:14
97xj_bandwagon 97xj_bandwagon is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

Quote:
Originally Posted by techno1154 View Post
Is the distributor set to cylinder #1 or #6? I have been a mechanic since the early 1970's. Two years ago I set the distributor in my XJ to cylinder 6 i.e. cylinder 6 was ready to fire but the distributor fired cylinder 1. I dam near tear the entire 4.0 apart in an effort to find why it would not start.
The rotor is pointing to the 5 oíclock position at cylinder 1 tdc compression stroke.
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  #7  
Old December 2nd, 2019, 21:17
97xj_bandwagon 97xj_bandwagon is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

Quote:
Originally Posted by 4x4JeePmaNthINg View Post
usually the distributor is off, did you install this with a punch? been here before lol and i thought i had it right.

are all the plug wires in the right place, and fuel injection plugs?

do you know the valve head is in good condition?

you could try starting in flood mode if you think everything else is good. pedal to the floor and crank to clear the block.

its always the little things that getcha at this point haha
Plug wires are in the right spot along with the injector wires
The head seems to be in good condition.
Iíve cranked with the pedal down and i can hear cylinders firing but it wonít turn over
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  #8  
Old December 2nd, 2019, 21:24
97xj_bandwagon 97xj_bandwagon is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

Doing a compression test tomorrow. I couldnít get a reading on the old head and it had some damage on the cylinder 6 valves from the piston exploding so I went ahead and replaced it.

What is the minimum compression these things need to run???
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  #9  
Old December 2nd, 2019, 22:02
BALTANAKT BALTANAKT is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

If you have spark and fuel it has to be your timing.
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  #10  
Old December 2nd, 2019, 22:09
97xj_bandwagon 97xj_bandwagon is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

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Originally Posted by BALTANAKT View Post
If you have spark and fuel it has to be your timing.
Thatís what Iím thinking.. But I canít figure out how to get it to line up perfectly with the punch method. If the compression checks out good tomorrow then Iíll definitely go after timing.
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  #11  
Old December 3rd, 2019, 06:37
RCP Phx RCP Phx is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

You never answered about how you determined #1 TDC?
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  #12  
Old December 3rd, 2019, 06:52
RCP Phx RCP Phx is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

I will add that we call my brother-in-law 180 Ray for 40yrs, he has never stabbed one right the first time!
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  #13  
Old December 3rd, 2019, 06:57
97xj_bandwagon 97xj_bandwagon is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

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Originally Posted by RCP Phx View Post
You never answered about how you determined #1 TDC?
Pulled the valve cover off and when the intake valve opened I continued to the 0 mark.
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  #14  
Old December 3rd, 2019, 06:58
97xj_bandwagon 97xj_bandwagon is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

Quote:
Originally Posted by RCP Phx View Post
I will add that we call my brother-in-law 180 Ray for 40yrs, he has never stabbed one right the first time!
I did that when i first put it in and it was shooting flames out of the intake lol.
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  #15  
Old December 3rd, 2019, 09:44
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techno1154 techno1154 is offline
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Re: Engine swap, Have spark, fuel, and timing, Crank No Start

Quote:
Originally Posted by BALTANAKT View Post
If you have spark and fuel it has to be your timing.
Quote:
Originally Posted by RCP Phx View Post
I will add that we call my brother-in-law 180 Ray for 40yrs, he has never stabbed one right the first time!
Quote:
Originally Posted by 97xj_bandwagon View Post
I did that when i first put it in and it was shooting flames out of the intake lol.
It is difficult to say whether or not the head is good but I am with the above quotes,... it have to be timing.
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Patrick

#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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