<FONT COLOR="red"><U>PROBELM FIXED!!!!! The map sensor was the problem!</U></FONT>Thnx for your help every one!

&lt;3 honda-tech

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Another update:

Almost 99.9% it's the map sensor i got.

I got some info from a Uberdata forum moderator, and he gave me this equation...

5 volts / map sensor's bar = map singlal volts

SO, that means

5 volts/ 3bar= 1.66volts hence, if oyu have a 3bar, you look for 1.6v

---&gt; 5 volts / 2bar = 2.38 votls

That's what i got as my reading!!!! i obviously have a 2bar map sensor

Thank you Big Wig and 93turbo16 for your help guys!


Update:
pretty much concluded on faulty map sensor.. either wrong bar, or not working properly. Just ordered NEW GM 3bar w/ pigtail, so we'll see if that does the trick.

I'll let you guys know once i wire that up

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Hey everyone! I need some help diagnoseing my problem.

I've recently boosted my b18b ej1, but i've been having probelms getting it to run right. first off my setup:

specs :
---&gt; hardware:
- garret t3/t4 50 trim. .48 a/r
- spoolinperformance mani/dp/dumptube (cloosed loop) 2.5" downpipe
- tial 38mm wastegate (10psi spring)
- spearco intercooler
- tial 50mm bov
- 2.5" piping

---&gt; fuel manegment:
- s100 hondata w/ boost (not working for some reason) ---*now have uberdata*--
- walbro 255hp fuel pump
- dsm blue top 440cc injectors
- resistor box for injectors
- gm 3bar map sensor

Probelm:
I start the car up and it cant idle worth crap, drops down and down till whole car shakes and lights dim out. Secondly, it sounds like it's missfiring and not running on all four cylinders.

I can take it for a drive downt he road, and it seems to work better under load. I can give it wot and it'll start to pick up speed like normal, but it will missfire occasionally. Black smoke (probably rich) will come out while idle reving.

Before turbo was installled, idle was prefect. I never touched distributor nor the plug wires. Spark plugs are gapped to .028.

Spark plugs are also completely BLACK. Now would this have something to do with the missfire? Could it be possible my basemap is so rich for the motor that it's haveing a probelm sparking? I changed plugs and after just idleing for a minute plugs were completely black.



it's running straight from dp if that effect anything.

What's going on here? Please help me

pics for thread attention:





Modified by iGfrequency at 10:47 PM 4/18/2005


Modified by iGfrequency at 10:48 PM 4/18/2005


Modified by iGfrequency at 11:21 PM 4/18/2005


Modified by iGfrequency at 11:08 PM 4/24/2005


Modified by iGfrequency at 11:08 PM 4/24/2005

 

tech trouble shooting...

check your 3 bar wiring
make sure your running the new 3bar uberdata script...

and w/ 440's i wouldnt even bother w/ the 3bar your gonna run out of fuel well before full boost...

check your org timing w/ a timing gun

also what ar you reading for a/f at idle...hope your using a wbo2

 

3bar wiring is fine.

uberdata basemap is set for 3bar

440's run out of fuel from a 3bar?!? explain

Dont have a timing gun, but can get one

dont have wideband, im not tuning myself

 

basically unless your running a tiny tiny turbo the injectors will max out before you will even reach boost numbers that you would need to even have a 3bar map sensor

is your resistor box wired up correctly for your injectors,
are you throwing any codes

suprisingly so many people mess up with the resistor box install and end up having a bunch of bad problems due to this......

 

planing on 10psi. I know stock map reads up to ~10.63, so i figured it was would be safe to upgrade the map. Also it was more common for a 3bar to be sold then a 2bar, so that's why i have it.

Im almost 100% sure resistor box wiring is good.

 

Is it tuned? I see you said basemap so I would assume not. New plugs? New wires? Plug gap? If so try to get some tuning done.

 

not tuned yet hence it running on the basemap.

Plugs are new
plug gap is .028

 

Use Uberdata V 1.7. Set the "fuel cut value" tab in the Boost section to 8(there will be a 24 in there when you open the stock map). Problem should be fixed. Do that and return with results.

Phil

 

i bought my ecu from h-t member 93turbo16.

I just asked him if he did that, he say yes

any more ideas? thnx for your help guys

 

possible to check 3bar's voltages to see if it's working properly. Maybe it's bad?

would that be the cause to all my problems?

 

ok according to hondata.com website, 3bar voltage from map wire to gnd should be 1.6v (rather then 2.85 on a stock map)

I used a multimeter to test that and i found that mine reads 2.38v

what's wrong here?


here is my wiring (not soldered because i just rewired and im still testing)


Does anyone recognize this 3bar? i bought it off a h-t member....

 

That doesnt look like a GM 3bar to me...

http://www.robietherobot.com/storm/mapsensor.htm

 

http://www.robietherobot.com/storm/mapsensor.htm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondaguyef &raquo;</TD></TR><TR><TD CLASS="quote">Use Uberdata V 1.7. Set the "fuel cut value" tab in the Boost section to 8(there will be a 24 in there when you open the stock map). Problem should be fixed. Do that and return with results.

Phil</TD></TR></TABLE>

Damn it someone got it before me. I have tuned cars before where that exact problem happen. I usually set it to 12 though. Give us your map too and tell us what version you are using. We can help you out. This is def. a Uber problem, because your car can run underload and not idle (fuel cut thing).

 

doesnt have to be a gm 3bar tho...

How can i tell THIS one is a 3bar?

 

wow man.. your plugs are pretty damn black.. looks like really rich to me...

 

yep and that's all in one minute of idleing!

it's gotta be miss reading signal from my map sensor!

i think some idiot sold me a 1bar so its getting a sending a higher voltage which would cause ecu to throw in more fuel. As well as effect idle.

 

change back to stock map sensor and try it out bet you its your problem.

 

your base map is most likely fouling out your plugs..

Your running really rich..

your 3 bar has a totally different plug then your stock map sensor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jordo &raquo;</TD></TR><TR><TD CLASS="quote">your base map is most likely fouling out your plugs..

Your running really rich..

your 3 bar has a totally different plug then your stock map sensor. </TD></TR></TABLE>


my basemap is fine.

.... "3bar has different connector then stock"... whats your point?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by project dc2 &raquo;</TD></TR><TR><TD CLASS="quote">change back to stock map sensor and try it out bet you its your problem. </TD></TR></TABLE>

if i do that, i need to change my basemap to read 1bar. i dont have tools to do that

 

here is my thread i purchased this 3bar from...

https://honda-tech.com/zerothread?id=1125799

does anyone recognize this 3bar from any type of car? can i show you some info to confirm it's 3bar?

 

can anyone confirm a probelm?

 

My car ran messed up too off a basemap that i thought was fine ran exactly as you say i didnt know what to do so i started over made a new map using a different version of uber burned it on the chip again and my car has been running ever since.

 

I have seen many 2 bar and 3bar map snesors. I have never seen one like the one you have that is claimed to be a 3bar. You should have 5 volts at connector C (Yellow/red wire on your harness) and 1.6 volts at connector B (white wire on the factory harness) if it is a 3 bar. You got a reading of 2.38 volts though so, I am wondering if it is a 2bar? Keep us updated on the info you find out and we'll help. Have you ever actually seen the basemap you have in your car?

Phil