626 manifold quetsion....yet another thread

[MazdaSpeed626]

needs more standalone ECU...haha, sounds like some tuning needs to be done.

 

[micahlarson]

hmm so why would someone want to do this update? ie swap the manifolds?

 

[Alejo_NIN]

hmm so why would someone want to do this update? ie swap the manifolds?

search for 626 manifold and you'll find out...

 

[hotrodf1]

my car idles better than ever, only thing is tyhat when the car is cold, it bogs at lower RPM's for some reason.

i haven't got a cel yet, and i shouldn't get one either since everything is connected and working perfectly, but who knows.

so far is been great

the car today seemed alot faster than it ever has!
WOOT?

i'm really happy with the outcome.

The CEL is gone now. Car was missing just a bit for a little while, now its fine. I dunno. I guess I'm good to go.

 

[hotrodf1]

I still have the cold start problem after I changed the manifold. If I start the car when its cold outside, like 30 F, and try to move the car, it's difficult. It just wants to die if I give it any throttle.

If I just ease on the gas and gently move the car, it will take off okay.

I had a TransAm that used to do this, and it finally threw a code for a bad MAP sensor. I changed that little guy and the car ran perfect after that. Anyone have a MAP sensor go bad on the MSP I wonder? Course it seems odd that the problem "appeared" after the mani. swap.

 

[Alejo_NIN]

we don't have map sensor unfortunately, we have MAF sensors

i still have the bog down when is cold thing

one question tho, do you have your EGR connected?

i don't, and i'm kinda blaming that, but if you do have conencted then the problem lies somewhere else...maybe a bad leak? but if so, wouldn't the car ALWAYS run like s*** and not go away when the engine is hot?


hmm..

 

[hotrodf1]

we don't have map sensor unfortunately, we have MAF sensors

i still have the bog down when is cold thing

one question tho, do you have your EGR connected?

i don't, and i'm kinda blaming that, but if you do have conencted then the problem lies somewhere else...maybe a bad leak? but if so, wouldn't the car ALWAYS run like s*** and not go away when the engine is hot?


hmm..

My EGR is connected in fact. I had to use two stock tubes, cut and weld them together to make a workable solution. I don't "hear" any leaks, but that doesn't mean that there isn't one.

Also, the car was running really good once it warmed up just a little, but lately it's felt kind of "lazy" I guess is the best word. Just seems like it doens't boost as soon in the powerband. Its really weird.

Also, as the car is warming up, maybe in the first 5 - 10 min. of driving, when I let off the gas, and have the clutch in, it sometimes wants to die. Idling at like 500 , 400 RPM and whatnot. What the DEVIL??

Then after I get to work, (30 min drive) it will be idling sweetly at around 800-900 RPMs.

I don't get it.

 

[Alejo_NIN]

what manifold are you running?

 

[Shadow102]

we don't have map sensor unfortunately, we have MAF sensors

yes we do have a MAP sensor along with the MAF sensor


and i wouldnt worry about the cold start problem i had mine do the same thing ever since i installed my injen and exhaust you need to just let the car warm up a little bit. I have never thrown a code for it and have never had any adverse effects from it happening

 

[Alejo_NIN]

actually, i don't think is a map sensor at all, i think you are referring to the BOOST solenoid....

if i'm wrong, can you point where said map sensor is located please?

 

[hotrodf1]

Alejo, I think you may be thinking of the Speed/Density type of air metering, which is the other way of monitoring engine airflow.

IIRC

I thought the MAP sensor was close to the firewall, passenger side.

I'm not sure that a vehicle will run very well or at all without a MAP sensor to "know" what kind of load conditions it is under. Not aware of any late models that get away without this sensor. Throttle position won't tell you what you need to know because the load will depend on the RPM at that point.

I thought I read several posts stating that there was indeed NO boost control solenoid on these cars. I have followed the line from the WGA to the BPV to the IM and never have seen a boost control solenoid to speak of. I understood it was basically a mechanical system with no electrical intervention. Am I wrong here?

 

[Alejo_NIN]

i don't wanna say you are but i've never heard of a map sensor either...might be wrong too

so far mazda calls the sensor by the firewall on the passenger side a "boost solenoid" i dunno why tho

 

[hotrodf1]

i don't wanna say you are but i've never heard of a map sensor either...might be wrong too

so far mazda calls the sensor by the firewall on the passenger side a "boost solenoid" i dunno why tho

really. . . now you got me curious.

is it that the one that feeds the big black canister looking thing on the firewall? If so, mazda may be shutting the vac feed off when the motor goes into boost , although I would think a simple check valve woudl take care of that.

Anyone knew where the MAP sensor is on these motors. I may do a little searching.

 

[Alejo_NIN]

yea, they're actually 2 sensors and they look similar, one feeds from vac on the manifold, then that sensor feeds the second sensor which in turns feeds the canister you talk about which recirculates gases back into the fuel tank...

 

[hotrodf1]

yea, they're actually 2 sensors and they look similar, one feeds from vac on the manifold, then that sensor feeds the second sensor which in turns feeds the canister you talk about which recirculates gases back into the fuel tank...

Are they solenoids or truly sensors I wonder.

 

[Shadow102]

The MAP sensor is in fact located right behind the passenger shock tower. It had the mitsubishi symbol on it. When i first put my manifold on the car i did not have enough vac line so i didnt hook it up and the car threw a MAP sensor code upon further research it is a MAP sensor. There is no wastegate control solenoid my guess is that the MAP sensor is just a back up to the MAF and for the fuel cut. Reasoning behind this is that most cars will not start let alone run without the MAF plugged in but my buddies P5 started and ran with the MAF unplugged

 

[hotrodf1]

The MAP sensor is in fact located right behind the passenger shock tower. It had the mitsubishi symbol on it. When i first put my manifold on the car i did not have enough vac line so i didnt hook it up and the car threw a MAP sensor code upon further research it is a MAP sensor. There is no wastegate control solenoid my guess is that the MAP sensor is just a back up to the MAF and for the fuel cut. Reasoning behind this is that most cars will not start let alone run without the MAF plugged in but my buddies P5 started and ran with the MAF unplugged

I wonder if I will be able to tap that wire (perhaps by the ECU harness) to use for MAP sensor logging on my LM-1. How would I go about finding out what pin the MAP sensor wire is on the ECU connector?

 

[Alejo_NIN]

thew reason i say is not a map is because map sensors have 3 cables going out...like the three bar map from GM

i stil don't think it is a MAP but as i said, i could be wrong

 

[Alejo_NIN]

i ust found this:
http://protege5.ugly.net/01-40b.PDF
check on page 2 item number 11 by the firewall passenger side.
it is labeled as: EGR Boost Sensor on a p5 but as we know it doens't change for the mazdaspeed

check atatchement...

 

[msp35]

wouldn't a "boost sensor" be a MAP sensor....just another name?

If you were to look up the "boost control solenoid" part # it should just be a vacuum line.