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 Post subject: bucking when cold
PostPosted: Tue Apr 01, 2014 4:10 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 698
Location: Mission Viejo, CA
Hello guys, it's been so long since I've visited; that's a good sign the 'ol Astro is running great. I'm now at 191k.

My problem as of late is the stuttering, bucking, etc when it's cold. I leave the neighborhood early in the morning and it's fine, but once on the freeway, until it warms, it starts to buck. I'll put the cruise control on and leave it. After a bit of bucking, it works it's way out of the system and it continues to run fine the entire rest of the day.

My guess is a sensor …ideas?

_________________
1998 Astro, 218,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Edelbrock shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box


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 Post subject: Re: bucking when cold
PostPosted: Sat May 03, 2014 9:17 pm 
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I am merely driving my van
I am merely driving my van

Joined: Sun Apr 27, 2014 8:52 pm
Posts: 7
Location: Manitoba Canada
Check & be sure that the heated air intake duct (That crinkly cardboard vacuum cleaner looking hose thingy) from the exhaust manifold to the air intake isn't crushed, missing, disintegrated etc. Air filter would be next followed by fuel filter. Poke around a bit...surprising what you can see that WON'T throw a code. THEN run the codes, if any. Gotta start somewhere. right?

WHOOPS...just saw you have a K&N; are you running a cold air intake?


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 Post subject: Re: bucking when cold
PostPosted: Mon May 05, 2014 3:08 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 698
Location: Mission Viejo, CA
thanks for your response. K&N, but not a cold air intake, all stock ducting.

_________________
1998 Astro, 218,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Edelbrock shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box


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 Post subject: Re: bucking when cold
PostPosted: Tue May 06, 2014 5:18 am 
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I sleep in my van
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Joined: Sun Sep 10, 2006 5:42 am
Posts: 276
Location: British Columbia
Cleaned your mass air flow sensor lately?

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James from B.C.
1992 Safari - R.I.P.
GM Grand Master Techncian


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 Post subject: Re: bucking when cold
PostPosted: Tue May 06, 2014 3:04 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 698
Location: Mission Viejo, CA
I changed the intake manifold gasket and replaced the spider injectors. At that time, I also cleaned the Mass Air Flow. That was about 30k ago. Due for another?

_________________
1998 Astro, 218,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Edelbrock shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box


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 Profile  
 
 Post subject: Re: bucking when cold
PostPosted: Thu May 08, 2014 5:05 am 
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I sleep in my van
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Joined: Sun Sep 10, 2006 5:42 am
Posts: 276
Location: British Columbia
No harm doing a mass air flow sensor cleaning & it is simple to do & costs nothing. Since you are asking for ideas, another suggestion is a slightly restricted fuel filter or fuel pressure dropping to the threshold of meeting the minimum required amount. A cold (not warm) engine requires more fuel to operate. If the fuel pressure or flow amount is low, this could result in your issue.

_________________
James from B.C.
1992 Safari - R.I.P.
GM Grand Master Techncian


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 Post subject: Re: bucking when cold
PostPosted: Thu May 08, 2014 2:56 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 698
Location: Mission Viejo, CA
a few ideas i hadn't considered. fuel pumps never last on Astro's so you may be on to something.

_________________
1998 Astro, 218,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Edelbrock shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box


Top
 Profile  
 
 Post subject: Re: bucking when cold
PostPosted: Thu Jul 13, 2017 10:42 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 698
Location: Mission Viejo, CA
UPDATE: It turns out it was low on trans fluid

_________________
1998 Astro, 218,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Edelbrock shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box


Top
 Profile  
 
 Post subject: Re: bucking when cold
PostPosted: Mon Apr 09, 2018 3:01 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 698
Location: Mission Viejo, CA
So many miles later, the problem returned and became worse. It bucks when idling along, such as when on cruise control on freeway. Basically, it's noticeable when no or little fuel is being supplied. With this determination, I finally figured it out and 100% fixed it. The distributor was worn and needed replaced. $100 and an hour of labor and it is back to perfect. This was a long term troubleshoot experience. We're now at 221,000.

_________________
1998 Astro, 218,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Edelbrock shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box


Top
 Profile  
 
 Post subject: Re: bucking when cold
PostPosted: Mon Apr 09, 2018 3:14 pm 
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Joined: Tue Aug 04, 2009 5:45 pm
Posts: 532
Location: San Diego, CA
Great work!

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"My minivan is cooler than your bro-truck"
2003 Astro AWD Astrolander/ZMB - GTRV Top Transplant, 4" OLV Lift, NP233 T-case, evolving interior
1995 Safari GTRV Organ donor - gutted and gone.
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 Post subject: Re: bucking when cold
PostPosted: Tue Apr 10, 2018 12:49 am 
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I get chills without my van.
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Joined: Sun Aug 11, 2013 2:42 am
Posts: 94
Location: Ft. Lauderdale, Florida
Bucking at "part throttle" while cruising, (especially when you have over 150K miles) is typically a worn distributor. It happened to me. Sorry I didn't see this post in 2014, to post my reply! Glad you found the problem!

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2000 Chevy Astro LS AWD | 31" LT265/70R17 Tires | 8" LIFT | 10" TOTAL
92 Chevy Astro Shorty | V8-350
http://www.CruisinSouthFlorida.com


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