my car bogs at around 4k rpms when i am accelerating. could this be my secondary injectors? i put soem fuel injector cleaner in there and ran a tank through it and it ran decent for a while (still with the 3800 hesitation) now i put a half-quart of MMO in my gas and they seemed to be clogged up again. also, my boost sensor is not working and i have no pill in the vacuum line. could this possibly be part of the bogging?

 

Sounds like your 6th ports arent opening properly.

 

87TII = No 6th ports....

....so, theoretically, I guess, you could kindof say that they are not opening properly...

 

yeah, you beat me to it evilrotor. any other ideas?

 

im beginning to think that no one can fix my problems. maybe thats why i post like every day and get no response either that or people are just annoyed everytime they read them.

 

I think your first guess with the secondaries is probably the correct one. As to why and what?

Damm, where are the experts when you need them.

Well, at least you getting bumped to the top...

 

yeah.. and where in the bejesus can i get a pill for my boost sensor hose?

 

Orifice from the Mazda dealer. I put the part number up a week ago on someother post.

The orifice, or the lack of, causes not so much a bogg as a jerk.

Bog seems to be a secondary injector thing. If you can slowly accelerate to say 4-5000 in forth gear and not experience the bog, then start experimenting.

I know way of finding out exactly what causes it. When your on the gas hard and hit 3500 rpm, the primaries cut back as the secondaries open up. It could be irratic opening secondaries, bad ground to the boost/pressure sensor, bad grounding to the ECU.

You could swap the primaries with the secondaries and see if there is a difference. Keep in mind the secondaries really don't get that much work in daily life. They sit there awaiting the 3500 rpm plus something to tell them there is a load on the engine(boost/pressure sensor). So they are underused.

There was a factory bulletin that tried to cure this problem by adding an additional ground to the boost sensors ground wire. Works for some people. Others have more good fortune by reworking their engine and chassis grounds and others the ECU ground wires(by adding additonal grounds to the existing ground wires in the plugs).

With the car off, I'd go out there and put a meter on the ground wire at the boost/pressure sensor(either pure black or brown/black depending on the year) and make sure you have less than a ohm b/t there and the battery negative ground. Try for 0.1 ohm.

Some say get the injectors cleaned.

Different things have seemed to work for different folks.

 

Dont roll your eyes at me.... Hehe, sorry about that, didnt see any car description, but I guess If I wouldve read his sig more carefully i wouldve seen DP and FCD . Whoops . I just saw 4000rpm stumble and jumped to conclusions.

 

its alright man. i hate my life too.

 

atleast your car runs.

 

Verify all the grounds, my problem got solved by doing so. Add extra ground wires also.