Experienced technician needs HELP!!! with a crazy acting volvo
#1
Experienced technician needs HELP!!! with a crazy acting volvo
Ok so just a quick note about me, I am a professional auto tech with 15 yrs experience and ase certs honda toyota blah blah blah. More importantly this nutty volvo. I bought it from a friend and no joke an hour later it is broken bad. Here are some symptoms and what ive tried. Rough idle, hesitation, something i will describe as a jutter on attempted accel. Now some facts ETS light is on and has been for a while. Car goes in and out of limp mode (i assume this) car sometimes has niod to #1 #2 #4, sometimes not, has no pcm signal to #2 coil. I am begging for some ideas. Am I looking at a bad ETM causing all this, Is the PCM shot, is it potentially bad pcm ground or socket connections. I am at a loss. By the way alternator voltage is 13.96v, I have cleaned all ground connections I could see easily, I took the ETM off and cleaded and stared at it (staring seemed to do no good, odd). HELP!!!
#5
Yeah I been there too, the first time i unplugged it while running it died. Then I unplugged it and started it tryin to throttle it to keep running and could but the other issues still seemed to be there. I have never seen a bad maf cause lack of noid or no coil signal, can that do that on volvo cars?
#7
#10
Ok so just a quick note about me, I am a professional auto tech with 15 yrs experience and ase certs honda toyota blah blah blah. More importantly this nutty volvo. I bought it from a friend and no joke an hour later it is broken bad. Here are some symptoms and what ive tried. Rough idle, hesitation, something i will describe as a jutter on attempted accel. Now some facts ETS light is on and has been for a while. Car goes in and out of limp mode (i assume this) car sometimes has niod to #1 #2 #4, sometimes not, has no pcm signal to #2 coil. I am begging for some ideas. Am I looking at a bad ETM causing all this, Is the PCM shot, is it potentially bad pcm ground or socket connections. I am at a loss. By the way alternator voltage is 13.96v, I have cleaned all ground connections I could see easily, I took the ETM off and cleaded and stared at it (staring seemed to do no good, odd). HELP!!!
#11
Any codes stored?
How many miles?
The TPS is in the electronic throttle body. The ETM might be bad. Bad part is that it most likely just went out of the extended warranty on it. If that is bad you will end up spending about $1200.00 to fix it.
Also make sure one of the intercooler hoses did not blow off.
How many miles?
The TPS is in the electronic throttle body. The ETM might be bad. Bad part is that it most likely just went out of the extended warranty on it. If that is bad you will end up spending about $1200.00 to fix it.
Also make sure one of the intercooler hoses did not blow off.
#12
NOID is acronym basically meaning "computer" signal to the injector. I am a master technician and an trained to replaced nothing until scientifically sure of the problem so my thinking goes like this. Cyl #2 is misfireing so why? check to see if spark is present, no it was not so why? spark plug is new, coil works on other cylinders so coil is ok, so i go further, what fires the coil we need power, ground, and pcm signal to "fire" the coil i checked all this and the signal is missing meaning it is not being sent or not reaching the coil, I checked the continuity of the signal wire form as near to the pcm as i could get and the wire has no shorts or excessive resistance. So I am down to either the pcm is bad or connection to the pcm is loose of this ETM is bad and causing wierd issues as I am somewhat unfamiliar with volvo control systems and this unit all togather.
#14
TECH, I checked the hoses, this is a wierd one. It has 150k on it. The wierd thing to me is why do the problems change? I had no noid then I had it, the #2 coil signal is dead. Is the component known as the powertrain control module in most vehicles bad?(I dont know the volvo proper term) anyway what info can I give you to help figure this out? My scanner will only access the engine management codes which are misfire codes, well thats kinda obvious. And injector circuit codes where i had them unplugged using the niod light. I guess bottom line can the ETM cause ALL this or am I barkin up the wrong $1200 tree.
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#20
Well thats whats so wierd. This car ran fine. the ets loight was and had been on for months. I pay for the car and on the way home it develops a hesitation so I tear into it. Injectors are right there so I yank #1 it made no difference, all others did. S I pull the cover off and check plugs all new. So I check coil the coil seemed dead so I swapped it with no.2 now 2 was dead. Shut it off and started lookin at maf, looked fine. went back to check noid and was missing on 2 cyls, then checked coil signal and now it is gone on #2 (WTF). So I go back over it and as it stands now all coils are ok, cyl #2 has no coil signal, cyl #4 has no noid. And when you mash the throttle it revs very slowly and tops out at 3k rpm(limp mode?)