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| cold start; geo wont start when cold | |
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| Tweet Topic Started: Feb 27 2009, 09:09 PM (4,159 Views) | |
| Bank2me | Aug 15 2017, 04:54 PM Post #76 |
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Advanced Member
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No tach in this one and yea I think it smooths out once I feather it. |
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| suzukitom | Aug 15 2017, 05:43 PM Post #77 |
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Tom
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I think we need to stop and answer some questions, since we jumped into this existing thread started by another member, and assumed your car had exactly the same symptoms. Prior to you making any adjustments to your throttle body: (1) Did your car suddenly develop an inability to idle smoothly when cold? (2) When the engine fully warmed up, did it idle normally/smoothly? (3) At this point, were the only adjustments you made to (1) the TPS position, and (2) to place the dime onto the ISC stop or ISC plunger tip? |
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| Bank2me | Aug 15 2017, 06:51 PM Post #78 |
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I just got the car a month or so ago. When I first drove it, it did seem to shake a little bit when I test drove it with the engine warm. Now after I got it I had it sitting in my garage for a couple weeks to do some other repairs (cv axle, tie rods) I would start it up and it would sometimes start fine without having to give it throttle and other times I had yo give it gas. Now that I got the other things fixed, I started driving it and the one cooler morning around 60 degrees it didn't want to idle while cold. But if I go somewhere and have it parked for an hour it starts and runs on its own but it will shake. And yes my only adjustments that have been made were just the TPS and the dime on the ISC stop. |
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| suzukitom | Aug 15 2017, 07:14 PM Post #79 |
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Tom
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I'm uploading an picture below of the expected TPS voltage with no feeler gauge inserted and the engine fully warmed up. The throttle stop screw should be resting on its stop, and the ISC motor plunger should not be extended when the engine is fully warmed up and idling. This 0.54 Volt reading remains the same whether the warm engine is running, or turned off with the ignition switch still on. (It is safest to take the measurement with the warm engine switched off) ![]() Can you compare this with a measurement of your current TPS voltage after your engine is fully warmed up? Edited by suzukitom, Aug 15 2017, 07:20 PM.
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| Bank2me | Aug 15 2017, 08:59 PM Post #80 |
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I'll try that tommorow and report back Tom!! |
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| Bank2me | Aug 16 2017, 10:02 AM Post #81 |
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Ok Tom so with the engine warm and no feeler installed the reading is .62 volts |
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| geo4thewin | Aug 16 2017, 10:13 AM Post #82 |
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Have you done a compression check Bank2me? |
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| Bank2me | Aug 16 2017, 10:14 AM Post #83 |
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Not yet but was thinking of doing one today. |
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| geo4thewin | Aug 16 2017, 10:16 AM Post #84 |
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I would start there, I have had 2 metros that would run bad when cold because of bad compression in one cylinder. |
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| Bank2me | Aug 16 2017, 10:38 AM Post #85 |
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Oh no shit hmm I'll try and do a compression check sometime today. |
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| Dystopiate666 | Aug 16 2017, 12:05 PM Post #86 |
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Tree Banger
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Especially with the noticeably rough idle. I was surprised no one had recommended a compression test yet on this topic. Why dick around and chase ghosts if the engine isn't sound? |
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| Bank2me | Aug 16 2017, 06:33 PM Post #87 |
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Ok guys so I did the compression test and came up with these numbers and for the record it's a 94 Metro base... 140 psi, 115 psi, and 123 psi. |
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| David95237 | Aug 16 2017, 06:46 PM Post #88 |
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Throttle was open? Lowest minimum number is 156 for a good motor. |
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| suzukitom | Aug 16 2017, 06:53 PM Post #89 |
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Tom
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Please verify compression test procedure: (In addition to holding throttle wide open during cranking) All plugs removed Fuel injection fuse removed when cranking Engine warmed up first Compression reading peak value taken when pressure reading stopped rising for each cylinder? Battery fully charged? Edited by suzukitom, Aug 16 2017, 06:54 PM.
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| Bank2me | Aug 16 2017, 07:41 PM Post #90 |
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Yep fully warmed up. Throttle wide open battery charged. And yes I cranked a while on each cylinder. Fuel injection fuse and relay removed. What do you fellas think? I think it's time for a cylinder leakdown test. But i have never performed one before. |
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TPS_voltage_engine_hot_no_feeler.jpg (119.76 KB)
3:49 AM Jul 11