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| 1999 metro lsi 1.3 5 speed; Cylinder kicks in at high rpm | |
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| Tweet Topic Started: Nov 13 2016, 06:46 PM (391 Views) | |
| k9_zeke | Nov 13 2016, 06:46 PM Post #1 |
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The car started running rough. It threw a Cade for misfire in cylinder 4 and a downstream o2 sensor. Replaced o2 sensor and plugs. It threw the codes again with no change with how the motor ran. So I did a compression test. Cylinder 1- dry 175. Wet 175 2- dry 175. Wet 175 3- dry 155. Wet 157 4- dry 75. Wet 75 When I started it had smoke from oil. I had to move the car still running rough but as soon as I got the Rpms up the 4th cylinder kicked in had a little smoke from the wet test and as long as I keep Rpms up it runs fine. When I shift into 2nd it runs rough till the rpms get high. Before I start throwing money at this does anybody have any suggestions. |
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| freegeo | Nov 13 2016, 08:49 PM Post #2 |
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Find out why the # 4 cylinder has low compression. That is the cause of the misfire. Can you do a leak down test? |
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| k9_zeke | Nov 13 2016, 09:17 PM Post #3 |
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I will see about getting a kit to do one. |
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| freegeo | Nov 13 2016, 09:42 PM Post #4 |
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I didn't realize you were in the Indy area. Wish I had time to come help you but I work almost every day. |
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| MarkyMayhem | Nov 17 2016, 11:59 AM Post #5 |
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4th cyl exahust valve or rocker assembly. Thats just a guess based on experience with the 1.3 and the limited info but - I would 100% start there. You may just need a lifter & or rocker |
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| MarkyMayhem | Nov 19 2016, 09:34 PM Post #6 |
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3 is a little off compared to 1&2. Overall compression #s aren't quite as important as consistency. Could be a crack or headgasket leak between 3&4. That leakdown test is tge way to go. |
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| freegeo | Nov 20 2016, 11:25 AM Post #7 |
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The numbers can be just as important. The FSM states 199 is standard compression and 156.4 is the minimum. 14.2 psi is the max allowed between any 2 cylinders. Lots of people have ran the engines below the min. but it starts to effect engine efficiency and performance. Edited by freegeo, Nov 20 2016, 12:30 PM.
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| myredvert | Nov 20 2016, 11:36 AM Post #8 |
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myredvert
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![]() If someone is satisfied with the reduced performance and economy and their goal is to continue to operate the vehicle as long as possible without spending more money than absolutely necessary on it, and it has not developed any unacceptable driveability issues, THEN the number is not as important as the consistency across all cylinders. |
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| freegeo | Nov 20 2016, 12:29 PM Post #9 |
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That is a good point. |
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| MarkyMayhem | Nov 20 2016, 10:04 PM Post #10 |
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Agreed! (good posting emoji goes here) That's why I said not QUITE as important! Edited by MarkyMayhem, Nov 20 2016, 10:06 PM.
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