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1997 chevy astro van won't accelerate pass 20 mph


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animal21
New User

Jul 13, 2010, 6:00 PM

Post #1 of 3 (3690 views)
post icon 1997 chevy astro van won't accelerate pass 20 mph Sign In

I was driving down the freeway when all of a sudden my 97' chevy astro van wouldn't accelerate pass 20 mph. I floored the gas pedal and there is a deep bogging noise and check engine light came on. Long story short, came home and got it diagnosed. It said the MAF (mass air flow) needed to be replace. Went and got a new unit, replaced it and check engine light went away. Started it up for a spin and still same problem. Van still wont go pass 20mph. Went ahead and replaced throttle position sensor and ignition pickup sensor. Still no luck!!!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 14, 2010, 2:37 AM

Post #2 of 3 (3680 views)
Re: 1997 chevy astro van won't accelerate pass 20 mph Sign In

You may want to check for a restricted Catalytic Converter. That would also cause a MAF code.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Loren Champlain Sr
Veteran / Moderator
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Jul 14, 2010, 6:24 PM

Post #3 of 3 (3672 views)
Re: 1997 chevy astro van won't accelerate pass 20 mph Sign In

animal; (cool moniker, btw) Agree with HT... 99% of the time, MAF sensors can be cleaned, but too late for that, now. <sigh> A plugged cat will cause the symptoms you are describing. You can connect a pressure guage to the orifice that the O2 sensor is mounted. You shouldn't see more than 1-2 psi. Another way is to connect a vacuum guage to the intake manifold. At idle, you should see 17-20 hG. At cruise (2500rpm) , the vacuum should be as great or greater than it was at idle. When an engine runs poorly, it can damage the catalytic converter. We have a saying in the 'business'. Cats don't die. They are 'killed'. Good luck.
Loren
SW Washington






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