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Tool Talk Discussion Forum

hard starting sonoma problem solved-tip.

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glennster

05-08-2008 05:29:25




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had a 98 sonoma come into the shop with an intermittent hard starting problem. scanned the truck, had error code p1626 anti theft system fuel enable circuit. with a fuel pressure gauge hooked to the fuel rail, cycling the key caused intermittent fuel pressure, 100k + miles on truck. turns out the ignition key cylinder tumbler was worn, causing a false theft reading and shutting down the fuel pump. that was a new one on me. thought i'd pass that along.

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BobPa

05-09-2008 15:04:53




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 Re: hard starting sonoma problem solved-tip. in reply to glennster, 05-08-2008 05:29:25  
Thanks for passing along the good tip.



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dave guest

05-08-2008 21:24:20




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 Re: hard starting sonoma problem solved-tip. in reply to glennster, 05-08-2008 05:29:25  
You can bypass with a resistor. Did it on 94 Buick. Can't remember details.



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MarkB_MI

05-08-2008 19:25:53




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 Re: hard starting sonoma problem solved-tip. in reply to glennster, 05-08-2008 05:29:25  
My wife had a 2000 Blazer that had the same problem under warranty. It would refuse to start, but would fire right up ten minutes later. Finally it happened one day when I was home. I gave it a shot of ether and it fired right up. So I took to the dealer and told the service manager it had a fuel system problem. He immediately answered "the ignition switch is bad". I told him he was nuts but he was right.

I'm pretty sure the current Passkey systems don't have this problem, because there's no physical connection between the car and the chip in the key.

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rockyhawaii

05-08-2008 19:12:26




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 Re: hard starting sonoma problem solved-tip. in reply to glennster, 05-08-2008 05:29:25  
Fixed a couple of Grand-Ams last year, same problem. GM made a few versions of their Pass-lock system and they are all junk. Real problem because the code doesn't always show. That's what you get in a society that doesn't allow people to shoot car thieves.



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Goose

05-08-2008 08:25:28




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 Re: hard starting sonoma problem solved-tip. in reply to glennster, 05-08-2008 05:29:25  
Thanks for the tip. My Olds has the "Pass Key" ignition. Once the microchip failed in the key and the starter wouldn't engage. A message flashed on the driver info display, "Defective ignition key. Wait three minutes and try again".

I waited three minutes and it started right up. Apparently after three minutes the computer bypasses the Pass Key circuit. Seems kind of defeative, but I guess the typical thief isn't going to sit there for three minutes, if he even knows about the bypass.

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