Edmunds.com | Inside Line | Auto Observer Your Account | Help | Directory
You are here:
![[F]](http://a332.g.akamai.net/f/332/936/12h/www.edmunds.com/media/townhall/webxicons/site.gif){kind=small}
Forums
Hatchbacks Chevrolet Metro/Geo Metro Chevrolet/Geo Metro
1692 messages, Last post on Oct 24, 2009 at 5:27 PM
You are in the Chevrolet Metro/Geo Metro Forum. Your Host is pf_flyer
|
Replying to: alniter (Jul 10, 2009 9:10 am)
|
|
|
Replying to: zaken1 (Jul 10, 2009 10:07 am) Steve in Florida
|
|
|
Replying to: alniter (Jul 10, 2009 10:27 am) |
|
|
|
|
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
|
|
|
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!!
|
|
|
|
|
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...)
|
|
|
Replying to: shaggyman1 (Jul 23, 2009 1:33 pm)
|
|
|
|
|
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.
|
|
|
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.
|
|
|
|
|
Replying to: zaken1 (Jul 23, 2009 4:48 pm) VIN code 6 refers to the fuel system (8th digit in your VIN), 6 being Throttle Body Fuel Injection- so a G10 with TFI. All of my TPS units appear to have only one switch (idle), rather than two, (the other being for WOT) but from what I've gleaned so far there is a third type with a continuous variable resistor as used on the 1.3 with port injection. I'll check on the MAP- I think mine is plastic, but I'm not sure. |
|
You are here:
Forums
Hatchbacks Chevrolet Metro/Geo Metro Chevrolet/Geo Metro
New? Join Now!
Forum Tools
Search Forums
Browse by Vehicle
1997 Geo Metro
2001 Chevrolet Metro
Browse by Board
Browse by Topic
Today's Chats
