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Geo Stalling Problem
Topic Started: Jul 29 2014, 01:24 PM (1,717 Views)
Metromightymouse
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Powdercoat Wizard

The failure point for compression can be as low as 90 or sometimes even lower under certain conditions. All 3 cylinders at or below 110 is not likely to run very well when 190 to 200 is new. There is a pretty good possibility the issue is related to your compression numbers and your description of how it was running fits. Double or triple check your timing and plug routing against the information provided here as other manuals have been shown to contain errors.
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GeoFan55
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Ok I just redid a compression test last night. when I crank the engine for about 3 seconds I am getting 155-160 PSI in all three cylinders. When I crank for 5 seconds I'm getting 180-185 PSI in all cylinders. So at this point I'm not worried about compression. My starter crapped out on me last night and im getting a new one in the morning. What I don't understand is that the last person who owned it put a Mitsubishi starter on it. I did attach the ground wires on the back of the throttle body as well as cleaning the two grounds on the firewall. I have removed my spark plugs which were soaked in gasoline and torched the gas and the carbon deposits off of them. It has a brand new TPS sensor and is adjusted accordingly. Does anyone know how to test your ignition coil? Alldata is too vague on the subject. I will recheck the timing and recheck for a good blue spark tomorrow. But all in all I am utterly confused why it will not start.
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GeoFan55
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I now understand that Geos come with Mitsubishi and Nippondenso starters. Is this correct?
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Metromightymouse
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GeoFan55
Aug 15 2014, 01:41 PM
I now understand that Geos come with Mitsubishi and Nippondenso starters. Is this correct?
Yes.
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myredvert
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myredvert

Quote:
 
Ok I just redid a compression test last night. when I crank the engine for about 3 seconds I am getting 155-160 PSI in all three cylinders. When I crank for 5 seconds I'm getting 180-185 PSI in all cylinders.
Out of curiosity, what was so different about the way this this test was performed that changed the results so significantly from the previous two tests?

More information in FSM Section 6E2-A1, Chart A1-3, ENGINE CRANKS BUT WILL NOT RUN.

link>>> 1994 FSM Section 6E2-A1

Good luck :thumb
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GeoFan55
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The only difference between the compression tests was the amount of time cranking the engine. The first time I only cranked the engine for around 2 seconds. The next test I cranked for 3 seconds and five seconds.
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GeoFan55
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Thanks myredvert for the link!
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myredvert
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myredvert

That would explain it. Cool. :thumb

It's been a long time since I have used AllData - by any chance do they have the correct FSM compression specs listed with their procedure?

Based on the few things I have seen copies of on here, they have looked like direct copies of the applicable FSM pages/sections.
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David95237


When I do a compression test I listen for it to hit 4 times. It wont go up much after that.
I was probably taught that in High school. long time ago.
Edited by David95237, Aug 15 2014, 05:19 PM.
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GeoFan55
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Ok well the Geo now runs perfect. What the problem was is that the mark on my cam gear is wrong. if you pull the valve cover and look at the valves, the intake valve was open. So all I did was turn the cam counter-clockwise about 90 degrees and it runs perfect. Starts up like a dream and does not stall, not to mention the remarkable increase in lower end torque. Thanks for all the help and theories. I guess you cant always trust if people transfer parts or if the manufacture messed up! Anyway it was a great learning experience and not to mention the Geo knowledge! :)
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Woodie
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Oh great! New timing procedure:

1) Very carefully line up all timing marks at TDC
2) Turn counterclockwise ABOUT 90°
3) re-install timing cover and bill customer

I suspect you've got the wrong timing sprocket (or something).
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