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1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation

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backyardmechanic
New User

May 19, 2012, 11:15 PM

Post #1 of 7 (2670 views)
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
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May 20, 2012, 2:26 AM

Post #2 of 7 (2624 views)
Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation 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
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May 20, 2012, 5:04 AM

Post #3 of 7 (2613 views)
Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation 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, 6:22 AM

Post #4 of 7 (2607 views)
Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation Sign In

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

Check engine light on?





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nickwarner
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May 20, 2012, 9:46 AM

Post #5 of 7 (2595 views)
Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation 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
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May 21, 2012, 8:27 PM

Post #6 of 7 (2554 views)
Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation 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
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May 22, 2012, 2:48 AM

Post #7 of 7 (2550 views)
Re: 1989 mazda b2600i 2.6 4 cyl loss of performence throttle hesitation Sign In


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

Tom






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