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Hatchbacks Chevrolet Metro/Geo Metro Chevrolet/Geo Metro
1692 messages, Last post on Oct 24, 2009 at 5:27 PM
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I'm trying to replace my rear catalytic converter on my base-model 1.0L 2000 Metro hatchback. The problem is all the ones online that claim to be "direct fits" for my model look nothing like mine! Mine, front to rear, consists of: (1) 15" of pipe preceded by a bolt-on end that matches the pipe before it; (2) 13" cylindrical conveter; and (3) about 3" of raw pipe that slides into the pipe after it and is clamped there. The ones online have either no pipe on either end, or have way-too-long pipes on one end that curve and don't have the bolt-on. Plus, the converters themselves are more rounded rectangular blocks than cylinders. Am I missing something? Any help would be appreciated. Thanks, Steve in Florida
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Replying to: alniter (Jul 10, 2009 9:10 am)
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Replying to: zaken1 (Jul 10, 2009 10:07 am) Steve in Florida
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Replying to: alniter (Jul 10, 2009 10:27 am) |
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I know I have seen this on one of the forums, but can't seem to find in in search. 1996 Metro G10 runs perfectly, EXCEPT..... Idle surges under electrical load such as blower fan or headlights. Idle jumps up to 2000 RPM and drops to 1500 Rpm about once a second for 8 or 10 cycles, then returns to normal idle until the throttle is opened even slightly- then repeats. It does this when driving whenever the pedal is slacked off during deceleration, resulting in a rather unnerving pulsation, as if one was tapping on the accelerator pedal. Troubleshooting charts don't seem to address this adequately, so if someone can steer me in the right direction I would be very grateful. TIA
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Replying to: shaggyman1 (Jul 18, 2009 11:50 am) But it may take several tries to get it zeroed in to where it runs best. Before attempting to adjust the TPS; the igntion timing should be set to 6 degrees BTDC with a timing light; while the check connector terminals are shorted as described in the manufacturer's instructions. And the spark plug gap should be set to .042" I hope this helps!!
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Replying to: zaken1 (Jul 18, 2009 12:22 pm) I thought I might have found the root of all evil: I set the timing, and was tinkering with the TPS when I glnced down and saw the timing move a couple degrees. As the diagnostic connector was jumpered, I got very suspicious- on probing the ground terminal, I found NO ground. Backprobed the wire and got good ground. Fine! I cut the wires and twisted them together: lo and behold! the timing was sitting at 1 BTC, not the six I had set it at. It appears that I have been running retarded forever! Gaaahhh! Hope I didn't burn another valve.... I tried setting the TPS with a feeler, etc, but it would not start or run cold- kept tinkering until I found a spot midrange (richer) that would allow it to start and idle, but it still dies when given any throttle, unless I let it warm up for two or three minutes. I drove 45 miles, and the ECU set a code of P0123: TPS Switch A Circuit High Input. Checked the input from the ECU, and it is a steady 5V, like it should be. Cleared the code put in a new battery, and am anxiously awaiting tomorrow's trip to see if the new battery helps any. (okay, but sometimes a straw is just what you need to grasp...)
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Replying to: shaggyman1 (Jul 23, 2009 1:33 pm)
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Replying to: zaken1 (Jul 23, 2009 2:12 pm) I'm going to find a shady spot and do some backprobing in the harness. The coolant sensor has been replaced, and doesn't seem to be the culprit, even though it certainly appears that temperature is the determining factor.
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Replying to: shaggyman1 (Jul 23, 2009 2:27 pm) They also used a different MAP sensor in the 1989-91 3 cyl models; which I find runs a bit richer (which I think would be a benefit in your situation). It has a thick plastic section where the mounting bolt goes through; while the later unit uses a metal plate in that location. It will mate with your harness plug. If someone installed the wrong MAP sensor, or if your engine's compression has now changed enough to have leaned out the mixture; the earlier MAP sensor would be worth trying. Mine is labeled 18590--60B00, and underneath that is another line reading 079800--1540.
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