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 Post subject: Hesitate when first entering the freeway, not choked correct
PostPosted: Fri Apr 12, 2013 8:47 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 691
Location: Mission Viejo, CA
Something new has been happening these past few months, can't figure it out.

Background:
186k miles
fairly new rebuild on rear end and trans
tune up just a few years ago, maybe 30k or so


I start the van, jump on the freeway and I feel it cut on and off, hesitate, shudder, etc. If I engaged the cruise, I can really feel it. It goes away in less than a mile and doesn't do it again until it sits overnight upon first start up again. Once warm it never does it. After arriving to work and it sits at work all day, ti doesn't do it either.

Maybe a "choke" issue?

_________________
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: Hesitate when first entering the freeway, not choked cor
PostPosted: Sat Apr 13, 2013 1:39 pm 
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Joined: Sat Sep 09, 2006 10:35 pm
Posts: 4429
Location: New Haven, NY
Well there is no choke on the fuel injected engines, but it does sound like an open/closed loop running issue. I am not real familiar with what sensors are used during open loop compared to closed loop so hopefully one of the more technical guys can help. Have you pulled any codes or pending codes yet?

_________________
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy


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 Post subject: Re: Hesitate when first entering the freeway, not choked cor
PostPosted: Sat Apr 13, 2013 3:14 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 691
Location: Mission Viejo, CA
notice choke was in quotes, i wasn't sure what to call the process of "waring up" a FI. lol
no codes at all.

_________________
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: Hesitate when first entering the freeway, not choked cor
PostPosted: Sat Apr 13, 2013 8:11 pm 
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Joined: Sat Sep 09, 2006 10:35 pm
Posts: 4429
Location: New Haven, NY
I figured being in quotes meant you knew there wasn't an actual choke. Wish I could help you with more troubleshooting ideas.

_________________
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy


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 Post subject: Re: Hesitate when first entering the freeway, not choked cor
PostPosted: Mon Apr 15, 2013 3:41 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 691
Location: Mission Viejo, CA
At first I wondered if one of the rear bearings were dragging, they weren't replaced when i rebuilt the rear end. What killed that theory is it never does it unless it sits overnight. Hmmm.

Anyone else have any guesses?

_________________
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: Hesitate when first entering the freeway, not choked cor
PostPosted: Mon Apr 15, 2013 4:50 pm 
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Joined: Sat Dec 02, 2006 8:34 pm
Posts: 2672
Location: Orlando, FL
Run some "Seafoam" through it. Half can in the intake and the other half in the gas tank. It could be something as simple as dirty injectors.

_________________
1996 Safari SLX Hotair balloon transport vehicle


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 Post subject: Re: Hesitate when first entering the freeway, not choked cor
PostPosted: Mon Apr 15, 2013 4:51 pm 
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Joined: Fri Sep 08, 2006 9:57 am
Posts: 2777
EGR valve perhaps? I'm not sure if the 98's were the same as the 95's but I remember having issues sort of similiar to that one time due to a sticky EGR valve...but I'm only takin a guess here.


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 Post subject: Re: Hesitate when first entering the freeway, not choked cor
PostPosted: Mon Apr 15, 2013 4:57 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 691
Location: Mission Viejo, CA
I have a new spider injector upgrade somewhat recent, but the EGR valve, hmmm. Let me gander that.

_________________
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: Hesitate when first entering the freeway, not choked cor
PostPosted: Tue Apr 23, 2013 5:34 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
CMP retard issue?

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


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 Post subject: Re: Hesitate when first entering the freeway, not choked cor
PostPosted: Thu Jul 13, 2017 10:43 pm 
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I sleep in my van
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Joined: Fri Jan 19, 2007 10:07 pm
Posts: 691
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: Hesitate when first entering the freeway, not choked cor
PostPosted: Sat Jul 15, 2017 1:09 pm 
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I finally get the smurf thing
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Joined: Mon Nov 21, 2011 2:05 pm
Posts: 204
Location: central Oklahoma
Thanks for coming back with the answer, might help someone down the road. :partyman:


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