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1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation


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backyardmechanic
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May 20, 2012, 2:15 AM

Post #1 of 7 (1630 views)
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1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation Sign In

truck starts shuts off turns over the 2nd time and idles the idle is sometimes a severe shutter close to stall point but stays running ive adjust the cap and rotor on a whim ive adjusted the efi carb screw improves a little bit ive shecked my plug wires all have spark just put new plugs in and ive also adjusted the throttle positioning sensor still have severe throttle hesitation when the smallest amount of throttle is applied when throttle is applied motor shutters and wants to stall but comes back after 1 quarter applied throttle any info is help please and thank you


Tom Greenleaf
Ultimate Carjunky / Moderator


May 20, 2012, 5:26 AM

Post #2 of 7 (1584 views)
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Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation [In reply to] Sign In

With all due respect stop adjusting things you know nothing about as you are just making a possible fix that much harder,

T
_________________________________________
Long retired now


Hammer Time
Ultimate Carjunky / Moderator


May 20, 2012, 8:04 AM

Post #3 of 7 (1573 views)
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Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation [In reply to] Sign In


Quote
on a whim ive adjusted the efi carb screw


OK, I'll bite. What's an EFI carb screw since the 2 words are a conflict in themselves.




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Discretesignals
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May 20, 2012, 9:22 AM

Post #4 of 7 (1567 views)
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Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation [In reply to] Sign In

Probably means the air bypass screw for setting min air rate.

Check engine light on?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


nickwarner
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May 20, 2012, 12:46 PM

Post #5 of 7 (1555 views)
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Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation [In reply to] Sign In

EFI carb screws have a very delicate procedure to adjust and can cause the issue you have if not done properly.

1. muffler belt must be at proper tension and timed to 13 degrees advance at 60 degrees celcius

2. blinker fluid reservoir must be within spec and quality fluid used(I prefer Dr. Snake brand for my truck)

3. with the engine at idle, use a left handed metric crescent wrench and tighten screw to 15 foot-meters

4. back off 1/4 turn

5. if this procedure is followed exactly you will get 50mpg and the truck will never break down again.


nickwarner
Veteran / Moderator


May 21, 2012, 11:27 PM

Post #6 of 7 (1514 views)
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Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation [In reply to] Sign In

Its no fun to go fishing if there aren't any bites. Damn. Back to drinking for me.


Tom Greenleaf
Ultimate Carjunky / Moderator


May 22, 2012, 5:48 AM

Post #7 of 7 (1510 views)
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Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation [In reply to] Sign In


LMAO Nick. If pic don't show I'll try again but who knows?

Tom




1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation


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