idle again

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Rob0102

New member
hello,

having big trouble with my idle and was hoping somebody experienced wanna help.

its a newbuilt engine, bowtie, big heads, moldex crank and so on.. running nice and with power. before i swapped engine it was running nice idle and worked as it should,
but now its running bad and sometimes stop.

timimg is set 0, new distributor /wires / plugs.. vacum should be good. logged with datamaster. ground connection is good, and im out of ideas. get alot of trouble codes so im wondering if the ecm is ****ed or something else.
my wideband O2 is really upndown, but i dont know if it should be like that ?
any ideas ?

http://home.no.net/dizweb/tomgang.uni

Robert kristiansen :rant:
 
QUICK STORM

QUICK STORM

B.A.M.F. BMW Tech
Re: idle again

correct map sensor? new ignition module? what are the codes?

quick and dirty check, get a known good ecm and swap
 
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Rob0102

New member
Re: idle again

ye, its right 3barmap. gonna swap with a new spare tomorrow and see if it helps.
ignition module its same old but i bet its working.

tricky thing, i dont have a spare ecm to check :rant:
codes.. well :-D ... almost all...?

12, 13, 14, 15, 21, 22, 23, 24, 25, 31, 32, 33, 34, 35, 42, 43, 44, 45, 51, 53, 55

strange the engine is running.. and its starting and running real nice above idle
:roll:

Robert kristiansen
 
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Rob0102

New member
Re: idle again

yes, orginaly it was an ultimate chip but the former owner have reprogrammed it to more match the engine, works great. swapped to an ultimate to see if it helped but then it became even worse, and my electrical fans stopped working..

iell try to find an ecm,, but there is not many doing these cars around here :-/

Robert Kristiansen
 
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TurboGTU

New member
Re: idle again

Did you check the grounds to the engine? Is the ECM ground correctly? Did you try unplugging the batt for 20 seconds and then reconnecting it? IS your electric fan turning on automaticly with key on engine off and is the EVAP perge selinoid ticking like a clock?
 
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Rob0102

New member
Re: idle again

all grounds look good, resetting block learn on ecm with the fuses off 20sec,, every time when i change fp or timing..
electric fan is working good when it needs to start.
EVAP system is thrashed, vacum hose on throttlebody is plugged.

will go buy me a new igniton module tomorrow, more i adjust more headache i got.. today i adjusted the ignition 3 degrees back to see if it helped, same time i was playing with fp, then i got alot of trouble with having it to run.. adjusted it back to same as it was,, then it was pain to get running as it did.

reason i played with fp was that at wot, and above 12-14 psi of boost it was stumbling like it didnt get enough fuel.. so when going for ignition module i also will buy and change gas filter, just to be sure.

i also tried spraying "enginestart gas" around vacum hoses / throttlebody / intake to check if i got vacumleak, but it seemed good and did not notice any change.
 
berzerker

berzerker

wookie
Re: idle again

did you upgrade injectors ? i had the same problem after i did my build. truck ran horrible sputtered , and ran like poo . turned out i purchased low impedance injectors and did'nt realize it until i checked over the spec card for the injectors . put the correct injector drivers in the ecm .wham!! engine ran beautifuly ever since .
 
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TurboGTU

New member
Re: idle again

Ok only reason I said to check the grounds from the engine to battery and from frame to ECM and battery is that the O2 low refrance input is on the ground wire. IF your O2 is not ground right,,it will give a false O2 reading to the ECM along with garbage signals from RI, giving a verry bad idle and driability. A quick patch is grounding the turbo to the ECM ground. Do this by putting a wire on the compressor housing bolt and the other plice into the ECM ground or frame. THe other is using a 4 wire O2.

The unpluggin the ECM is that when I installed reflashed chips on my car without disconnecting the battery would make the ECM go into limp mode.

The fan and EVAP selinoid going off is when I had a bad chip or bad flash. ECM checksum and everything was out of wack. Just went into limp mode.

Are you shure those are all the codes your getting on DM. The grid is white, green. The red ones are the codes that set the SES light off. The green ones are the ones that the chip has enabled I think but are not fault codes. Green good, red bad.

SES codes 51,53, 55 are real bad. 51 is a bad flash or a zapped (static) prom or not installed correctly. 53 you can check with a volt meter while the engine is on. Prob a bad alternator. BUT it could also be a bad ECM voltage regulator. 55 could be a shorted quad driver or voltage regulator and even a zapped ECM.
 
#2875

#2875

built, not bought
Re: idle again

Rob0102 said:
i also tried spraying "enginestart gas" around vacum hoses / throttlebody / intake to check if i got vacumleak, but it seemed good and did not notice any change.
Click to expand...

this is a bullshit test, create a vacuum leak and spray that crap all around it and you will see what i mean. you need to pressurize the whole system and check for leaks that way.
 
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Rob0102

New member
Re: idle again

ej, thanks for the replys.
my dealer didnt have ignition module in stock but will arrive this wednesday :)

yesterday i swapped 3bar map with one that was on it before my buildup.(also a 3bar old type) swapped and unplugged ecm20sec. startet up and then it was became even worse.. when driving it was more lean, so after a few miles i swapped back 2 the new 3bar. then idle was a little better and and o2 showed right.
so wondering, is it a difference on 3bar map sensor new and old type...?

another thing, the last times it have stopped it have become worse to get started again, cold it starts almost before turning key but now i had to try 3-4 times with 5sec intervalls (warm). strange.. havent changed anything :-/

injectors should be right, purchased along with the ultimate chip from a "disapeared" syty webshop.... didnt find any card but the stamping was the same as on my old ones that followed engine.

yes i tried creating false leak and spray the shit around there, did notice engine change but will also try the biketube.

will probably try work hard on it wednesday again, until then i try hooking up laptop, grounding more and other small ideas.

btw, got some parts for sale. complete bottom engine with eagle-h, trw pistons, comp cam w higher lift. (still mouted toghether). live in norhtwest norway.
 
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Rob0102

New member
Re: idle again

a little sitrap.

changed ful filter, no luck, maybe a little higher fp.
changed ignition module, no luck, no difference.

used a biketube to check after leaks and i think maybe i found the spot. throttlebody leaks so mutch its hard to listen after another leaks.
next work is to try to fiks the throttlebody, cant afford a new one right now since i think they are pretty expensive. will also change/clean plugs since i have played so mutch with fp that they probably are messy..

dont understand the map sensors i got, a new and a old type. now im using the old one, if i swap to the new one i got too rich o2 and opposite. maybe i try order me a new oldtype.. along with a new msd coil :)

so long, robert
 
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