TTT

 

Interesting problem, I'll ask a few friends today about it. I'm assuming your OBD1 but what are your cam specs? Have You checked for any vacum leaks other than the breather. Do You have any tuning software?

James

 

obd1, 230/236/112, .544/.555

all the vacuum connections are on the intake, so is the breather now.

i have tons of computer software hehe. datamaster, tunercat, turbolink (a local companys program)

im thinking it needs a file pretty bad, however i wouldn't be able to get that until wednesday, possibly monday though. however i have one for this cam with stock heads, should i put that on and see? the car will run lean wont it, i mean **** it already probably is right? also the file is programmed for ported MAF, so should I take like 10-15% out of the MAF tables?

 

I'm not sure about the program. Do You have bigger injectors? All I did was adjust the constant of the injector size and left everything else stock. The car runs just fine on stock tune and our cams arn't too different. Do you have a ported maf. I am still using my stock one and have heard a few horror stories anout the other ones.

 

no injectors, no proted maf.

both stock.

i just found my chiltons hehe, and it says the reason the MAP is reading low is b/c high vacuum? I would most certainly think there isnt high vacuum hehe.

 

also forgot to mention that when i clear codes with datamaster, sometimes one of them will not shwo up for awhile, however the other one is always there. i will have to see which one it is later today.

 

I think most scanners will give you both "kPa" and "volt" readings. There is a table on my ScanMaster writeup that shows the relationship of volts - kPa - and "Hg. Low voltage means low manifold absolute pressure, which means high vacuum. Fof a stock cam, you will probably see 1.2V, or 9.5"Hg, or 33kPa. With a more aggressive cam, all of these numbers will go up. The values will go up to closer to 5V, 30"Hg and 100kPa at WOT, or if you just turn the key on and don't start the engine (=BAR).

MAP problems can be related to TPS problems. There is one criteria for setting the low MAP code when the thottle is in closed position (I think the code sets at less than 14kPa). Then it checks again when the throttle is greater than 21% open and looks for another value. So if the TPS is off, it might set up a combination of conditions where it sets the TPS code first and then MAP, but that would be an extreme case.

The numbers you got for the TPS wiring and sensor tests looks good. Need to get a scan. Can you post a scan, preferably in ".xls" format that we can look at?

 

i sure can post a scan fred, what do you want to see? just varying rpm? the car is on jacks right now. let me know and i'll get on that

 

You can just send the scan to me if you have it exported in ".xls" or ".csv".... I have a copy of DataMaster, but its on a different computer, so ".uni" is a complication.

Obviously we need TPS (both V and %), MAP. Then RPM, IAT, coolant temp, BAR, MAF, Spark advance. You can skip all the fuel stuff if its sitting on blocks. Just start is up, let it warm up for 5 minutes, then start logging. Let it idle, then bring the revs up slowly to whatever your neighbors can tolerate . Then rev it a few times with quick throttle blips. Should give us some data.

 

www.acaenterprises.com/scansunday.csv

i let it warm up for a bit, but i didnt wnat it to go up to 160 cause im not ready to do the whole coolant thing at the moment. What is the proper way to do that anyways? I filled the block through the thermostat hole, and the radiator. do i open the bleeder on the heater hose now? and wait until just coolant comes out, then i wait for the thermostat to open, see if the resivor needs more coolant, then open the screw on the thermo housing and repeat that a few times?

 

fred, i didnt see the MAF as a thing to select for the csv file.

When I ran this scan, the car was idling GREAT. it started out at like 500 then when it warmed up a bit jumped up to 800-1000 and stayed there.

I broke the clip on the map sensor harness, but the plug is in there pretty good....

 

open it in notepad if you guys are having trouble getting excel to open it

 

fred i got a longer scan well into closed loop now, the car was idling at 1500, does that seem right? also the o2s were very low in the 100s and 200s, is that rich or lean, i think stoich is around 800 right? if i remember right, IAC was in the 100s.

 

i guess o2s are standard at about 450mV, and rich is higher and less is leaner, so I guess im running lean then. Except for the fact that it stinks like **** and eats gas like none other lol.

the long term blms are split at 145 and 128, short are both at 128.

 

.........ttt...........