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Old 02-13-2011, 07:32 PM
Doctor Wily Doctor Wily is offline
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Default MAF or TPS or something else?

Good day forum!

This is my first thread (other than the introduction) so let me start off with a touch of background info.

I recently picked up a 94 b2300. Fun little truck to drive, ghetto as H3ck but fun to pop around town with. replaced a 96 taurus that was on it's last legs.

This truck needs some work to get it running up to where I want it to be. The main issue I am battling right now is a poor idle. The idle is very high at start, then after driving a short distance and coming to a stop light it will nearly stall out as I sit with the clutch in waiting for the light to change. If i press the throttle slightly (like barely) the idle will come to a slightly more appropriate level. I don't have a tach (yet) so i don't know exactly where it's idling at these low spots but it's low enough that the truck starts to miss and ALMOST stall. The other thing I have noticed is the acceleration seems to surge. The truck seems to speed up when I am holding the throttle at a constant point. It seems very "weak" in the lower throttle side as well. I feel I really need to get on it to have any sort of acceleration at all.

A few possible issues I suspect are as follows:

1) IAC- while I don't believe this would contribute to the acceleration issue it seems possible it could be related to my high and low idle...maybe

2) TPS- Hmm.... so we are having an issue with the surging/rising speed without moving the accelerator. seems possible that the TPS could be having issues...

3) MAF- Now i remember reading somewhere that a MAF issue could cause some of these symptoms and I also seem to recall seeing somewhere that a MAF failure was a somewhat common issue with these trucks. highly suspicious....

4) One or more of the above. I would not rule out the idea that I am looking at a compound issue.

Good news is I should be able to find out tomorrow. I have my auto electrical theory class tomorrow and we are testing sensors with the vantage and w/e he decides to have us use.

Anyone think I'm heading in the right direction here? any other suggestions?

Thanks for reading!
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Old 02-13-2011, 07:38 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: MAF or TPS or something else?

Clean your MAF IAC and Throttle body. Change plugs and maybe wires. Check air filter. You are in the right direction on what is causing the issue
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Old 02-13-2011, 07:43 PM
Doctor Wily Doctor Wily is offline
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Default Re: MAF or TPS or something else?

Quote:
Originally Posted by DiabloBlanco View Post
Clean your MAF IAC and Throttle body. Change plugs and maybe wires. Check air filter. You are in the right direction on what is causing the issue

Thank you Diablo. I appreciate the extra suggestions and I am glad to know I am heading in the right direction. I will run those tests with the vantage tomorrow and post back what I find from it.

Cheers
Wily
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Old 02-13-2011, 07:45 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: MAF or TPS or something else?

No prob, my truck was doing the same for a while.
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Old 02-13-2011, 07:49 PM
Doctor Wily Doctor Wily is offline
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Default Re: MAF or TPS or something else?

one thing i forgot to mention is the terrible gas mileage. I expected more than 15mpg around town with a 2.3 and a manual! whew!
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Old 02-13-2011, 07:50 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: MAF or TPS or something else?

When was the last time it had routine maintenence done?
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Old 02-13-2011, 07:54 PM
Doctor Wily Doctor Wily is offline
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Default Re: MAF or TPS or something else?

aha! a very good question and one that I don't have an answer to. I can only assume it should be done (i assume you mean plugs, wires, etc) as I have owned the vehicle for a month and the prev. owner surely didn't do any of that before he sold it. I'm sure some work is in order. now if only that snow would go away.......lol
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Old 02-13-2011, 08:09 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: MAF or TPS or something else?

It would be a good idea to Change EVERYTHING, meaning Oil, plugs, wires, filters, fluids, pads, (if wore out) and all that stuff.
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Old 02-13-2011, 08:19 PM
Doctor Wily Doctor Wily is offline
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Default Re: MAF or TPS or something else?

Quote:
Originally Posted by DiabloBlanco View Post
It would be a good idea to Change EVERYTHING, meaning Oil, plugs, wires, filters, fluids, pads, (if wore out) and all that stuff.
I hear that. Only thing i know for a fact is good is the oil. Prev Owner did that right before selling. Took it to a quick lewb. lol.

How bad is it to do plugs on this guy? i see the dual plugs per cylinder. Is it true you need to remove the exhaust manifold to get to the plugs on the driver side?

pads are on my list of things to do. I want to get the brakes done soon (brake light and abs light are on) nice thing is I have a brake class on wednesday nights and that gives me access to mega tools and lifts :-D.
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Old 02-13-2011, 08:21 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: MAF or TPS or something else?

IM not too sure on the mechanics of the Mazda. You are gonna have to ask one of those guys on here. Or check the How to's.
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  #11  
Old 02-13-2011, 08:49 PM
Doctor Wily Doctor Wily is offline
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Default Re: MAF or TPS or something else?

sure thing. I have a FSM for 97 and it's exceptionally similar to the 94. I'll reference that when it comes time. if anyone else wants it I can get you a link to download if there isn't one on this forum (havn't had a chance to explore yet).


Thanks for all the advice, I'll keep this post updated as things change!
Wily
(whylee)
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  #12  
Old 02-14-2011, 07:16 PM
Doctor Wily Doctor Wily is offline
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Default Re: MAF or TPS or something else?

Hi everyone, just thought I'd drop an update.

Did some diagnostic testing today.



the TPS and MAF tested good. Here is what we did find though. Apparently these vehicles are known for coking issues within the throttle body.





carbon that was cleaned out of the throttle body. was blocking the airflow and causing turbulence of the air making it thru.

While we were in there took apart the air box and found a gnarly air filter, so I replaced that as well



After all of this we found that the Prev Owner had dicked with the idle screw ( you know, the one you shouldn't mess with) so we had to adjust that down as well.

Truck idles now and that is pretty sweet, lol.

WIly
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Old 02-14-2011, 07:17 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: MAF or TPS or something else?

Sweet man! now clean that engine bay
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