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Jeep Wrangler YJ
YJ General Discussion
91 Jeep YJ - Cranks but No start - Have spark and have fuel at fuel rail
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<blockquote data-quote="RJones" data-source="post: 434729" data-attributes="member: 20152"><p>Back again. Same problem as before. Posting new article below. This thing is driving me crazy. </p><p></p><p>1991 Jeep Wrangler YJ</p><p>6 cyl 4.0L HO, fuel injected – Automatic Transmission</p><p>166,000 miles – (Has new crate motor with only 11,000 miles or so on it)</p><p></p><p>Anybody that can help me with this issue, it would be greatly appreciated! I know just enough to be dangerous probably, but I feel like I’ve done enough testing and troubleshooting that the jeep should be at least starting. I’m about ready to give up at this point! Below are a couple of links that I found in another forum and my problem seems to be almost identical. (His problem ended up being with the new distributor and the gear being rotated and it was out 180 degrees or something like that.</p><p></p><p><a href="https://Jeep Forum/threads/91-yj-has-fuel-and-spark-wont-start.1796873/" target="_blank">91 YJ has fuel and spark, wont start | Jeep Enthusiast Forums (Jeep Forum)</a></p><p><a href="https://Jeep Forum/threads/91-yj-has-fuel-and-spark-wont-start.1796873/page-6" target="_blank">91 YJ has fuel and spark, wont start | Page 6 | Jeep Enthusiast Forums (Jeep Forum)</a></p><p></p><p> (I also replaced the distributor like this guy did, because I have been wanting to due to some supsicions, and when it just died at a stop sign on me the other night, which it had done before awhile back, I decided to put in a new distributor. I was not getting spark, then I was getting spark. Very odd. I believe I have a timing issue of some sort and have had with this jeep for quite some time now. On a couple of occasions over the past couple of years the jeep wouldn’t start or it would just die on me. Setting to TDC at compression stroke piston #1 fixed the issue. If it is losing its timing after running great for a few months, I have no idea why.</p><p></p><p>Anyways, a year ago it did this same thing. I had it fixed, and the guy said it was the ignition coil, which tested out fine for me a year ago. This time it has a new position coil from where it was replaced then, Plus I am getting spark from coil and all 6 wires coming from distributor. I get voltage coming into the coil and also get a signal on the signal wire. The secondary resistance was reading low at 9.28K ohms so I thought it was bad. Haynes manual said it should be reading like 11.2K ohms to 15.3K ohms. I bought a new distributor just in case, but it reads exactly the same 9.28k ohms on secondary resistance. Plus I am getting spark so I have not replaced it.</p><p></p><p>I’m also getting fuel. One turn over of the ignition and not cranking it pressure gauge reads 31psi. Running (when it did run) around 38psi. It will leak down slowly and back to zero in a few hours, but it’s getting fuel. I can hear fuel pump prime every time. I did spray starter fluid in throttle body just to make sure and still won’t start. Does not appear to be a fuel issue.</p><p></p><p>The crankshaft position sensor reads good on the multimeter plus I get spark. However, I replaced it just in case. Both the old and new read the same so that shouldn’t be it.</p><p></p><p>I took camshaft sensor out of old distributor when I was having this problem before and suspected it. I put it on the bench and applied 5 volts to it and I could get it to drop voltage to zero by placing a screwdriver between the magnet and lead. I did this when I suspected it before. However new distributor came with new camshaft sensor. Camshaft sensor shouldn’t be the problem.</p><p></p><p>I have new spark plugs and wires and had been running them over a month before it just died the other night. Other than maybe a few slow starts which I think is pretty common with these jeeps, had been running good.</p><p></p><p>It has started since I put the new distributor on and even ran for like 10 minutes then died. Cranked it back up again ran without dying for a while. No rough idling or anything that I could notice. Now it will not start again and didn’t do anything to it since it last started. I have set TDC at compression stroke piston #1 yet again and even took distributor back out to make sure rotor was positioned just past #1 plug at around 5:30 position. It will not start! I also double checked myself by putting a little wooden dowel down in spark plug #1 hole before and after setting to TDC on compression stroke and dowel went from being 6 inches in hole to top of piston to less than 2 inches (to let me know piston was at top) once I felt the air coming out and set the camshaft to the zero (0) mark. Still will not start!</p><p></p><p>I think it might be a timing issue or I don’t have distributor set just right, but I don’t know what else to do if it isn’t. I do not have a timing light. It looks like the rotor is positioned right where it should be to at least start up.</p><p></p><p>I guess I could drop old distributor back in to make sure new one is not defective, but the jeep died the other night for a reason so I figured the old one might be an issue. Plus I am getting spark with new one so I would hope it would at least start.</p><p></p><p>I haven’t inspected timing chain due to having to take everything off and remove cover to do so, but I would hope with the newer crate motor with only 11,000 miles it would be okay, but can’t guarantee it.</p><p></p><p>I have checked my grounds best I know how. All the ones I could find, I was able to get continuity back to the battery ground by using a multimeter. I have also checked my fuses and checked my relays.</p><p></p><p>Anybody that can help me figure this out before I just give up and get rid of the jeep, I will be forever grateful! I am at my wits in!</p><p>Thanks in advance!</p><p>Randy</p></blockquote><p></p>
[QUOTE="RJones, post: 434729, member: 20152"] Back again. Same problem as before. Posting new article below. This thing is driving me crazy. 1991 Jeep Wrangler YJ 6 cyl 4.0L HO, fuel injected – Automatic Transmission 166,000 miles – (Has new crate motor with only 11,000 miles or so on it) Anybody that can help me with this issue, it would be greatly appreciated! I know just enough to be dangerous probably, but I feel like I’ve done enough testing and troubleshooting that the jeep should be at least starting. I’m about ready to give up at this point! Below are a couple of links that I found in another forum and my problem seems to be almost identical. (His problem ended up being with the new distributor and the gear being rotated and it was out 180 degrees or something like that. [URL='https://Jeep Forum/threads/91-yj-has-fuel-and-spark-wont-start.1796873/']91 YJ has fuel and spark, wont start | Jeep Enthusiast Forums (Jeep Forum)[/URL] [URL='https://Jeep Forum/threads/91-yj-has-fuel-and-spark-wont-start.1796873/page-6']91 YJ has fuel and spark, wont start | Page 6 | Jeep Enthusiast Forums (Jeep Forum)[/URL] (I also replaced the distributor like this guy did, because I have been wanting to due to some supsicions, and when it just died at a stop sign on me the other night, which it had done before awhile back, I decided to put in a new distributor. I was not getting spark, then I was getting spark. Very odd. I believe I have a timing issue of some sort and have had with this jeep for quite some time now. On a couple of occasions over the past couple of years the jeep wouldn’t start or it would just die on me. Setting to TDC at compression stroke piston #1 fixed the issue. If it is losing its timing after running great for a few months, I have no idea why. Anyways, a year ago it did this same thing. I had it fixed, and the guy said it was the ignition coil, which tested out fine for me a year ago. This time it has a new position coil from where it was replaced then, Plus I am getting spark from coil and all 6 wires coming from distributor. I get voltage coming into the coil and also get a signal on the signal wire. The secondary resistance was reading low at 9.28K ohms so I thought it was bad. Haynes manual said it should be reading like 11.2K ohms to 15.3K ohms. I bought a new distributor just in case, but it reads exactly the same 9.28k ohms on secondary resistance. Plus I am getting spark so I have not replaced it. I’m also getting fuel. One turn over of the ignition and not cranking it pressure gauge reads 31psi. Running (when it did run) around 38psi. It will leak down slowly and back to zero in a few hours, but it’s getting fuel. I can hear fuel pump prime every time. I did spray starter fluid in throttle body just to make sure and still won’t start. Does not appear to be a fuel issue. The crankshaft position sensor reads good on the multimeter plus I get spark. However, I replaced it just in case. Both the old and new read the same so that shouldn’t be it. I took camshaft sensor out of old distributor when I was having this problem before and suspected it. I put it on the bench and applied 5 volts to it and I could get it to drop voltage to zero by placing a screwdriver between the magnet and lead. I did this when I suspected it before. However new distributor came with new camshaft sensor. Camshaft sensor shouldn’t be the problem. I have new spark plugs and wires and had been running them over a month before it just died the other night. Other than maybe a few slow starts which I think is pretty common with these jeeps, had been running good. It has started since I put the new distributor on and even ran for like 10 minutes then died. Cranked it back up again ran without dying for a while. No rough idling or anything that I could notice. Now it will not start again and didn’t do anything to it since it last started. I have set TDC at compression stroke piston #1 yet again and even took distributor back out to make sure rotor was positioned just past #1 plug at around 5:30 position. It will not start! I also double checked myself by putting a little wooden dowel down in spark plug #1 hole before and after setting to TDC on compression stroke and dowel went from being 6 inches in hole to top of piston to less than 2 inches (to let me know piston was at top) once I felt the air coming out and set the camshaft to the zero (0) mark. Still will not start! I think it might be a timing issue or I don’t have distributor set just right, but I don’t know what else to do if it isn’t. I do not have a timing light. It looks like the rotor is positioned right where it should be to at least start up. I guess I could drop old distributor back in to make sure new one is not defective, but the jeep died the other night for a reason so I figured the old one might be an issue. Plus I am getting spark with new one so I would hope it would at least start. I haven’t inspected timing chain due to having to take everything off and remove cover to do so, but I would hope with the newer crate motor with only 11,000 miles it would be okay, but can’t guarantee it. I have checked my grounds best I know how. All the ones I could find, I was able to get continuity back to the battery ground by using a multimeter. I have also checked my fuses and checked my relays. Anybody that can help me figure this out before I just give up and get rid of the jeep, I will be forever grateful! I am at my wits in! Thanks in advance! Randy [/QUOTE]
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91 Jeep YJ - Cranks but No start - Have spark and have fuel at fuel rail
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