Don't quote me on this, but I don't think it'll throw a code for every misfire.photo_van wrote:For a long time I was thinking it was engine related, but because of how and when it manifests itself, I'm starting to think trans. Also, if any one or more cylinders is mis-firing, wouldn't it throw a code?
bucking at hwy speed
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Re: bucking at hwy speed
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Re: bucking at hwy speed
TimelessB: you're right AFAIK weak ones it won't detect ones stronger then that will set a pending code in the computer but won't light the CEL, if it continues missing or misses really badly it will set a code and light the CEL. I'm pretty sure thats how it goes
1998 GMC Safari AWD, BFGoodrich AllTerrain T/A
Jet performance tuner 91 octane preset, Jet under-drive pulleys
Rancho 999000 series shock, on-board controller to be installed later
DHC rock rails and skid plate Add-A-Leaf
G3500 front calipers
Zexel Torsen Diff
11" drums
180 amp Alternator
Long tru-cool 4590 trans cooler
1997 gone
Jet performance tuner 91 octane preset, Jet under-drive pulleys
Rancho 999000 series shock, on-board controller to be installed later
DHC rock rails and skid plate Add-A-Leaf
G3500 front calipers
Zexel Torsen Diff
11" drums
180 amp Alternator
Long tru-cool 4590 trans cooler
1997 gone
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Topic author - I sleep in my van
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Re: bucking at hwy speed
I didn't realize you can get a code without the check engine light coming on. I'll put the reader on it....
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
Re: bucking at hwy speed
Miles on van? Last tune up? Last fuel filter change? Last air filter change?
Miles on transmission? Last transmission service? Last transmission filter change? After market trans cooler installed?
The failure occurs under-load, but goes away when more throttle is applied, Correct?
Thanks, Jim
Miles on transmission? Last transmission service? Last transmission filter change? After market trans cooler installed?
The failure occurs under-load, but goes away when more throttle is applied, Correct?
Thanks, Jim
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Topic author - I sleep in my van
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Re: bucking at hwy speed
I've had the van since 24,000, it now has 93,000 miles.astroturf wrote:Miles on van? Last tune up? Last fuel filter change? Last air filter change?
Miles on transmission? Last transmission service? Last transmission filter change? After market trans cooler installed?
The failure occurs under-load, but goes away when more throttle is applied, Correct?
Thanks, Jim
No service other than atf/filter changes last one 79,000. Air filter either changed or cleaned at every oil change. No other "tune up" other than fuel filter changes.
I have not installed the cooler yet (it's in my shed; I know, first thing I should have done!)
Yes, under load, in 4th (not constant but now and then; when bad it might be several times in a 15 second period). Goes away when I get annoyed and either let up, or step on the gas, or manually drop into third.
Its been doing this for years, and is either getting worse, or I'm losing patiences, or both! I don't recall it happening before going to larger tires, but that was back at 28,000 and patiences isn't the only thing I'm loosing .
Thank you
John
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
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Re: bucking at hwy speed
I'm still thinking all can be well if you tune it.
the computer that is.....
http://www.tunercat.com/
the computer that is.....
http://www.tunercat.com/
2021 Yamaha Tenere 700 - Blue.
2016 Yamaha XSR900 - Silver.
1990 Astro - AWD - Brown.
1987 Astro - With 5 Speed & 4wd - Silver & Blue.
2016 Yamaha XSR900 - Silver.
1990 Astro - AWD - Brown.
1987 Astro - With 5 Speed & 4wd - Silver & Blue.
Re: bucking at hwy speed
Fuel pressure check, and Distributor gear check.
That's where I would look first.
Keep us posted, Jim
PS You may want to pull the doghouse at night and mist it with a spray bottle of water, to make sure none of your electricals are leaking.
That's where I would look first.
Keep us posted, Jim
PS You may want to pull the doghouse at night and mist it with a spray bottle of water, to make sure none of your electricals are leaking.
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Topic author - I sleep in my van
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Re: bucking at hwy speed
Thanks you guys. I'll look into the programing, as I would like to correct my speedo anyway.
I've been staying out of the doghouse, but have plans for a good going over for the 100,000 mile anniversary. I'll look for fireworks and see if I can figure out how to check fuel pressure.
I know I've got a vacuum leak some where, as my heater control goes from "dash" to "floor" when I loose manifold vacuum (on the gas pedal); those controls are vacuum servos aren't they?. But thats another question for another thread.
John
I've been staying out of the doghouse, but have plans for a good going over for the 100,000 mile anniversary. I'll look for fireworks and see if I can figure out how to check fuel pressure.
I know I've got a vacuum leak some where, as my heater control goes from "dash" to "floor" when I loose manifold vacuum (on the gas pedal); those controls are vacuum servos aren't they?. But thats another question for another thread.
John
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
Re: bucking at hwy speed
Vac Leak... Start here:photo_van wrote:Thanks you guys. I'll look into the programing, as I would like to correct my speedo anyway.
I've been staying out of the doghouse, but have plans for a good going over for the 100,000 mile anniversary. I'll look for fireworks and see if I can figure out how to check fuel pressure.
I know I've got a vacuum leak some where, as my heater control goes from "dash" to "floor" when I loose manifold vacuum (on the gas pedal); those controls are vacuum servos aren't they?. But thats another question for another thread.
John
viewtopic.php?f=55&t=746&hilit=no+blower+from+vents
Jim
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Re: bucking at hwy speed
be warned only good scanners will pick up pending DTC's i know mine will not
1998 GMC Safari AWD, BFGoodrich AllTerrain T/A
Jet performance tuner 91 octane preset, Jet under-drive pulleys
Rancho 999000 series shock, on-board controller to be installed later
DHC rock rails and skid plate Add-A-Leaf
G3500 front calipers
Zexel Torsen Diff
11" drums
180 amp Alternator
Long tru-cool 4590 trans cooler
1997 gone
Jet performance tuner 91 octane preset, Jet under-drive pulleys
Rancho 999000 series shock, on-board controller to be installed later
DHC rock rails and skid plate Add-A-Leaf
G3500 front calipers
Zexel Torsen Diff
11" drums
180 amp Alternator
Long tru-cool 4590 trans cooler
1997 gone
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Topic author - I sleep in my van
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- Joined: Wed May 18, 2011 4:38 pm
- Location: 7000' in the Mountains of California
- Been thanked: 3 times
Re: bucking at hwy speed
[/quote]
Vac Leak... Start here:
viewtopic.php?f=55&t=746&hilit=no+blower+from+vents
Jim[/quote]
Thanks Astroturf, that's exactly the problem (with the heater)! One more thing to get done while I'm in the doghouse.
It's been years since I was on this forum, so long that I lost my user name and password! It was one forum back then. You guys are all great!!!
John
Vac Leak... Start here:
viewtopic.php?f=55&t=746&hilit=no+blower+from+vents
Jim[/quote]
Thanks Astroturf, that's exactly the problem (with the heater)! One more thing to get done while I'm in the doghouse.
It's been years since I was on this forum, so long that I lost my user name and password! It was one forum back then. You guys are all great!!!
John
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
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Topic author - I sleep in my van
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Re: bucking at hwy speed
Ok. thanks Cobra.Cobra wrote:be warned only good scanners will pick up pending DTC's i know mine will not
John
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
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- I have my van tatooed on my cheeks
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Re: bucking at hwy speed
These values are for a 1:1 transmission ratio (3rd gear).
I don't think he's too off-the-chart. (RPM's shown will be slightly lower in overdrive).
Too bad he doesn't have the tow/haul button.
Last edited by MountainManJoe on Thu Jun 30, 2011 9:59 am, edited 1 time in total.
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Topic author - I sleep in my van
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Re: bucking at hwy speed
Cool chart
3.42 with 31" tires looks to be good for fuel economy. According to the chart, maybe better in 3rd gear. Perhaps I should do a test sometime. No bucking and better mileage would work for me!
3.42 with 31" tires looks to be good for fuel economy. According to the chart, maybe better in 3rd gear. Perhaps I should do a test sometime. No bucking and better mileage would work for me!
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
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- Location: Misty Mountains of Cowichan BC.
Re: bucking at hwy speed
that chart is 1:1 right. so,
With 3:42:1, 31" tires, Thats 2410, which is barely in the yello.
But the 700R4 in OD turns at .7:1, not 1:1
2410 * .7 = 1687 which is way to slow.
under 1700 RPMs in OD with load would make my van buck if it didnt kick down a gear.
Your van's computer is programmed to fuel and shift for about a 26-27" tire on 3.42:1, which is in the blue squares.
Tanks for the cool chart TB, can you tell me the speed that it must represent but doesnt tell.
I'm suspecting that your computer, re-calibrated for the correct gear/tire ratios, will shift when it should, instead of a little bit after it should.
Just my 2 cents.....
With 3:42:1, 31" tires, Thats 2410, which is barely in the yello.
But the 700R4 in OD turns at .7:1, not 1:1
2410 * .7 = 1687 which is way to slow.
under 1700 RPMs in OD with load would make my van buck if it didnt kick down a gear.
Your van's computer is programmed to fuel and shift for about a 26-27" tire on 3.42:1, which is in the blue squares.
Tanks for the cool chart TB, can you tell me the speed that it must represent but doesnt tell.
I'm suspecting that your computer, re-calibrated for the correct gear/tire ratios, will shift when it should, instead of a little bit after it should.
Just my 2 cents.....
2021 Yamaha Tenere 700 - Blue.
2016 Yamaha XSR900 - Silver.
1990 Astro - AWD - Brown.
1987 Astro - With 5 Speed & 4wd - Silver & Blue.
2016 Yamaha XSR900 - Silver.
1990 Astro - AWD - Brown.
1987 Astro - With 5 Speed & 4wd - Silver & Blue.