bad idle until I unplug the 3 bar map

[cloneman315]

Re: bad idle until I unplug the 3 bar map

did you get a scan tool?maybe you have stuck or bad injector,what chip is in this truck ?what injectors?what wbo2 do you have?i didnt even think they went that rich lol

 

[Trapper]

Re: bad idle until I unplug the 3 bar map

I was told they don't get that rich also, but my wob2 is off because its not warmed up. I'm suppose to get a laptop from the guy I bought the truck from soon with the data master loaded up so I figure I can wait on that instead of paying 300 for a scan tool that dosen't work, I went to AZ today and they loan them out but they told me that it dosent work for OBD1 so ok thanks.

 

[Tooky]

Re: bad idle until I unplug the 3 bar map

Ok tried to hook up my Ty to my PC with the Data master I have and no dice I messed with the settings and still no reading, and still idles like crap with the map plugged in any Ideas, I have done a search but noting found for my problem

I wrote a guide with photos on how to connect your PC to Data Master: http://www.powertuneplus.com/syclone/howto_stock13s.shtm

I include the "tricky" settings to get it to connect, too.

I suspect unplugging the MAP line just makes the truck "think" you are at 100 KPA (0 PSI, almost into boost) and thus it supplies more fuel, apparently making your truck run smoother. So it's possible you have a lean condition to begin with. It will take some troubleshooting to solve but I would start by collecting as much data about the condition as possible (DataMaster).

 

[Trapper]

Re: bad idle until I unplug the 3 bar map

I unpluged the pcm and checked the prongs today and see if they are ok and checked continuity from the ADLD port to the PCM its good. Now I'm just going to check the sencor wireing to about everything on the motor TPS and MAP tomorrow. I think my laptom with the datamaster might be here on Mon or Tues?

 

[Trapper]

Re: bad idle until I unplug the 3 bar map

TPS is in good shape now Im kinda leaning toward a stuck or bad injector, I know my fuel pressure drains off a little over time. probbably should change the oil after all this.

 

[Trapper]

Re: bad idle until I unplug the 3 bar map

Well it still starts but it still has a bad idle, and checked the oil today and wow fuel in oil and the pressure drops to 0 in about 10 mins or so,

 

[cloneman315]

Re: bad idle until I unplug the 3 bar map

that dosent sound like a stuck injector to me,your pressure will drop after that mutch time i would think,as long as it is instant,did you check that coolant sensor reading?

 

[cloneman315]

Re: bad idle until I unplug the 3 bar map

do we know what chip ,map sensor,injectors are even in it ?

 

[Trapper]

Re: bad idle until I unplug the 3 bar map

do we know what chip ,map sensor,injectors are even in it ?

Erue did the chip, it's a 3 bar map and RPM 75 injectors, well I checked the ohms today when I got home on the injectors 1,2,4,6 were at 2.5 and 3,6 were at 2.4, I don't know if .1 of a ohm makes a diff? So I was looking around for more clues and found # 6 was not hooked on top of the dis, so I plugged everything back in and hoped for the best it started, still have a check engine light but its shuts off every once in a while but dosent blink anything. the wbo2 finally got down to 11 then back to 10 to 9.8 and back and forth so I'm thinking its still rich, but if one wire made a diference maybe I have bad wires? I just put in new plugs I should of done that already when I was there, #2 is a PITA, I did check the ohms on the coolent sencor the next day and it was a different # when I checked it,
I get the Datamaster tomorrow. So well get some more answers I hope soon.

 

[cloneman315]

Re: bad idle until I unplug the 3 bar map

if you got the chip from eric im guessing it is based of phills 75 chip,so it might be open loop which once in a while you may get a cel and it will be a o2 code just ignore it,and yes a wire off will do that for sure,and ,honestly injectors very rairly go bad.

 

[cloneman315]

Re: bad idle until I unplug the 3 bar map

just do some runs and watch the wbo2 ,i mean a wire off is kind of something you should of found first,so check te BASIC stuff first

 

[Trapper]

Re: bad idle until I unplug the 3 bar map

Well tha last time I checked the chip was set at the1st setting, but when Kessler sent it he told me he also turned down the timing, I'm going to check that out later today too, I know it will run like crap with that set bad.

 

[Davemc1963]

Re: bad idle until I unplug the 3 bar map

Check the distributor. I found my distributor had cracked where the poles are, cant remember the correct name for it off hand ( possibly reluctor?), it ran very poorly and rich, belched out black smoke, really rich, then would run ok for a bit. It took me a good while to track down. I replaced it with a MSD billet one. A bit pricey, but when compared side by side with the GM one, I think it was money well spent IMO and it drops right in. The module checked out fine, but it just ran like cr@p. Might be worth a look.

 

[Trapper]

Re: bad idle until I unplug the 3 bar map

Check the distributor. I found my distributor had cracked where the poles are, cant remember the correct name for it off hand ( possibly reluctor?), it ran very poorly and rich, belched out black smoke, really rich, then would run ok for a bit. It took me a good while to track down. I replaced it with a MSD billet one. A bit pricey, but when compared side by side with the GM one, I think it was money well spent IMO and it drops right in. The module checked out fine, but it just ran like cr@p. Might be worth a look.

Thanks I was hopeing it wasn't that, but how did you trackit down did you just pull the distributor and look? Replacing that wouldn't be hard. Waiting on UPS as we speek.

 

[Davemc1963]

Re: bad idle until I unplug the 3 bar map

It was pure chance I found it, I was pulling my hair out. I had fitted new cap, rotor, plugs and wires, checked out the module had the ecu off and checked out all the connectors, reseated the prom etc checked out all the wires from the ecu to everything I could get at. But I had a lot of tach bounce as well come to think of it. If you search I posted on how I sorted that out with supplemental grounds. I always had a fair bit of rust in my original dissy, I suspect that may have contributed to the problem, or may have been partly as a result of it. The orange dust has seemed to plague GM HEI's for years, even though the V6 is a small cap divorced coil version. Basically I climbed on top of the engine (mind the intake crossover if you still have it) and gave it a thorough examination with a small maglight and inspection mirror and discovered the - I think its called the reluctor, the cast 'metal' ring with the pointed poles on it loose. It was actually in three pieces. I'm not saying this is your problem, but its something to check out. The hardest part was getting to the dissy clamp when replacing it.
Dave

 

[Trapper]

Re: bad idle until I unplug the 3 bar map

Well got the datamaster today finnally from giving up working on the F250, the biodiesel rubber boogers finnally got me, and got to get more hoses, no more bio for that truck, but I hooked up the Data master no dice just like I got from my PC. I adjusted the ADLD timing I even took off the handshack like recomended, ADLD adapter working no PCM detected? please shed some light my way guys, I recived this truck this way and I did buy a running truck at payment, I'm thinking bad PCM again. It has ground it has power.I have check the adld conector to the PCM for continuity. 7.5 on my WBO2 this sucks. :rant:

 

[WyoSyclone]

Re: bad idle until I unplug the 3 bar map

Does your ALDL cable have switches on it? If so they need to be set to the proper position.... mine doesn't have the switches so I'm not sure which is correct.... is the 10k setting correct guys?
The Datamaster "help" section has a great write up on troubleshooting connection problems with the laptop.

 

[Andreas]

Re: bad idle until I unplug the 3 bar map

Did you replace your MAP sensor? I looked thru this thread quite quickly so I might have missed that info.
FWIW I had really bad idle some years ago. Truck was so rich due to the bad MAP sensor that the truck died after ~10 - 15 seconds.
Swaped MAP sensor and truck run great.

 

[Trapper]

Re: bad idle until I unplug the 3 bar map

I was told just hook it right up and it should work but thier is no switches on the conection, I will try my new map sencor too.

 

[JSM]

Re: bad idle until I unplug the 3 bar map

I am assuming you have a map and a chip that match. 3bar map requires a 3 bar chip.