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 Post subject: Cold start issue
PostPosted: Wed Nov 26, 2014 7:02 pm 
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Joined: Thu Mar 20, 2008 6:34 pm
Posts: 11
Location: Shepherdstown, WV
'91 Metro 1.0 convertible.

I did a search but didn't find my exact problem.

Starts ok when temp is above 45f. When it is colder she just won't fire. Turns over but won't fire. It might try to fire but spits and pops. Or tonight she backfired after cranking for 10 seconds.

Is there a cold start system? Any suggestions?

We have not driven the car much in the last couple of years. Bought new for the wife! But in the last week she ran fine. But now the temp has dropped and won't start.

Thanks for any ideas.

Bill


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 Post subject: Re: Cold start issue
PostPosted: Wed Nov 26, 2014 10:31 pm 
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Suzuki Elder
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Joined: Mon Dec 01, 2003 12:47 pm
Posts: 11669
Location: columbus, ohio
bill, that's pretty typical of a worn out g10 engine. compression gets low enough that you can't build enough compression to get the engine to fire.

it's fairly common on a g10 with burned exhaust valves.

unplug the injector relay, hold the throttle wide open, and crank the engine over with spark plugs removed and a compression gauge screwed into one hole at a time to read compression on all 3 cylinders and record those values.

you should see numbers on all 3 cylinders above 150 psi with not more than 10% difference in any single cylinder. a new engine will have 200+ psi across the board.

after you record the dry values add a teaspoon of hole into each spark plug hole just before taking another compression reading. if the recorded values of the wet test increase it indicates bad rings. if there is no change and compression is low it indicates a burnt valve.

_________________
1991 Blue Geo Metro Convertible highly modified 1.0L Turbo3 5 spd. - 1991 Red Geo Metro Convertible customized with a Twincam 5 spd.

My Turbo3 Project
My Cardomain Page -Ol' Blue
My YouTube Channel
My Photo Gallery
SAAB Sonett II


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 Post subject: Re: Cold start issue
PostPosted: Thu Nov 27, 2014 11:09 am 
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Joined: Thu Mar 20, 2008 6:34 pm
Posts: 11
Location: Shepherdstown, WV
t3, thanks for the reply.

I'll try the compression check after the holiday weekend.

I was thinking that there might be a cold start system that was in need of work. Not that simple!

Bill


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 Post subject: Re: Cold start issue
PostPosted: Thu Nov 27, 2014 8:54 pm 
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Suzuki Elder
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Joined: Mon Dec 01, 2003 12:47 pm
Posts: 11669
Location: columbus, ohio
the cold start system is pretty much built into the injection system. it includes a cold start fuel enrichment operated by the coolant sensor, ecu, and single injector in the throttle body. there is an idle air solenoid which operates off and on to bleed bypass air into the bottom the throttle body.

i've had a number of cars that seemed to be running okay until the temperature dropped. then they just failed to start. i let them sit through the winter and when i tried to start them again in april they fired right up. they all had burnt exhaust valves.

_________________
1991 Blue Geo Metro Convertible highly modified 1.0L Turbo3 5 spd. - 1991 Red Geo Metro Convertible customized with a Twincam 5 spd.

My Turbo3 Project
My Cardomain Page -Ol' Blue
My YouTube Channel
My Photo Gallery
SAAB Sonett II


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