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Old 07-28-2003, 10:59 AM   #1
mcc
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Default Need help with a boost problem

My 94 ssei servic engine light went on at the top of Mt. Washington 6,400 ft.? For the next year or so the boost gauge wouldn't go past 0 and it was slow. A year later we went up the mountain again and when we came down it worked for a half hour. It also works for a minute or two everyday when I leave work so I manage to spin the wheels a little. One snap on comp. said code 640 Quad driver. A second, better comp. said another code, 4 digits but I can't find them right now. Any ideas? Thanks.
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Old 07-28-2003, 01:21 PM   #2
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Change your boost control solonoid (wastegate). It'* about 30 bucks if memory serves. I'm betting you get really shitty mileage, too.
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Old 07-30-2003, 12:19 AM   #3
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Follow Will on this. I had the problem with the 640 code for almost a yr. C/e light and all. I tried a new PCM but turned out it was the boost solenoid but if you call it that the dealer won't know what u mean. The dealer calls it a valve kit (pn#1235-3309. Price is like Will said abt $30.
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Old 08-02-2003, 06:56 PM   #4
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Okay, please tell me more about this boost control solenoid or valve kit as dealerships call it. My boost only goes up to about 9 psi but when i first did the smaller pulley conversion, it would get up to about 12 psi. I also have shitty mileage. I am only getting about 18 highway ugh. Do you think I need that valve kit from the delership. Also, where is the boost control solenoid? Thanks
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Old 08-03-2003, 10:13 AM   #5
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make sure your MAP sensor is pluged in fully, it is what monitors boost, mine came loose, broken clip on the plug, and my boost would constantly read 0, i popped the hood and it was loose, snugged it up and wella. just a idea.
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Old 08-16-2003, 07:27 AM   #6
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Default Does a 1995 sesc have a map sensor?

I was just wondering if a 1995 SE SC has a MAP sensor. It has no boost gauge.

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Old 08-17-2003, 09:42 AM   #7
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yeah, your car has a MAP sensor, should be a little rectangular black box just inbehind the SC. it'* roughly 3 inches by 1 1/2 inches big. it will have a 3 wire connector and a vacume line going to it. hope this helps.
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Old 08-17-2003, 08:06 PM   #8
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can anyone please tell me where the boost control solenoid is? I want to know if I should replace it and how easy/hard it will be. I am willing to buy a replacement to see if it helps out on boost and mileage. Thanks
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