payableondeath6 Posted November 2, 2010 Report Share Posted November 2, 2010 I recently purchased a V70R ECU from a member on here and he says the ECU was working when shipped. My car currently runs but has a bit of a rough idle and I've been dealing with getting rid of a slight misfire (variable P030X code) and PO172 along with a P0505. Without going into all the work I've done in trying to fix those codes just yet, does anyone know why the car will run great driving around and idle just a little rough but then when I popped the hood and swapped out the ECU for the V70R ECU it will run very weakly for about 30 seconds (with the UP arrow lighting up) and then just fade off and die? I did find a(nother) vacuum leak I will be fixing tomorrow. Car currently has new: Bosch MAF, NGK Iridium plugs, OEM plug wires, dist. cap, rotor, IPD HDTCV, thermostat, 2.5" post MAF tube, RIP, & nearly all new vacuum lines, & I'm sure I'm leaving plenty off. IAC valve has been cleaned thoroughly too. I appreciate any and all suggestions. This is my first Volvo and my first turbo car and I love it so far, even if it has been a real problem child. Link to comment Share on other sites More sharing options...
Reximus Posted November 2, 2010 Report Share Posted November 2, 2010 I recently purchased a V70R ECU from a member on here and he says the ECU was working when shipped. My car currently runs but has a bit of a rough idle and I've been dealing with getting rid of a slight misfire (variable P030X code) and PO172 along with a P0505. Without going into all the work I've done in trying to fix those codes just yet, does anyone know why the car will run great driving around and idle just a little rough but then when I popped the hood and swapped out the ECU for the V70R ECU it will run very weakly for about 30 seconds (with the UP arrow lighting up) and then just fade off and die? I did find a(nother) vacuum leak I will be fixing tomorrow. Car currently has new: Bosch MAF, NGK Iridium plugs, OEM plug wires, dist. cap, rotor, IPD HDTCV, thermostat, 2.5" post MAF tube, RIP, & nearly all new vacuum lines, & I'm sure I'm leaving plenty off. IAC valve has been cleaned thoroughly too. I appreciate any and all suggestions. This is my first Volvo and my first turbo car and I love it so far, even if it has been a real problem child. looks like you're missing the injector mod here oem glt injetors are small, even smaller than the oem turbo ones. the V70R ecu is programed to run with large injectors that will flow different rate at the same pressure and same duty cycle. the car is basically running way too lean the moment you plug the ecu into the car. since the ecu was unplugged, it will run with it's preprogrammed parameters since it hasn't "learn" your car yet. but my guess is, even if the car has warmed up completely with the V70R ecu, it will end up throwing P0172 system too lean bank 1 code again since the injectors aren't matching with the programmed parameters in the ecu. was the V70R ecu pulled from an automatic car? cheers! Link to comment Share on other sites More sharing options...
Tom. Posted November 2, 2010 Report Share Posted November 2, 2010 yeah rex usa spec R means no 5spd, ive seen t5 ecus run in glts no problems... you says the up arrow is flashing? never seen an ecu do that... Link to comment Share on other sites More sharing options...
Reximus Posted November 2, 2010 Report Share Posted November 2, 2010 yeah rex usa spec R means no 5spd, ive seen t5 ecus run in glts no problems... you says the up arrow is flashing? never seen an ecu do that... tom... you do realize that with a t5 and glt injectors we are talking about like 50cc out of 350cc difference right? that's within the 25% fuel trim limit that the computers could compensate for. but between the stock glt injector and the one lets say yours tom (greens) it's a big difference anyways, if they are all from auto cars, then you want to make sure that the ecu is made to run with the given transmission installed in the car. with a different transmission, there will be a different tcm. if the ecu and tcm are not programed to run together, then it will show up the "up" arrow indicating there is a fault. an example of this would be 96 tcm in a 94 auto. (i did this myself once without knowing it's different) the up arrow showed up after a few minute. it's just not programmed to run together cheers! Link to comment Share on other sites More sharing options...
payableondeath6 Posted November 2, 2010 Author Report Share Posted November 2, 2010 The ecu is for an awd iirc, my car is fwd. Would this be the issue? I can get bigger injectors as I've got a 15g on the way, but I want to make absolutely sure that's the solution and that up arrow has me doubting. Link to comment Share on other sites More sharing options...
Reximus Posted November 2, 2010 Report Share Posted November 2, 2010 The ecu is for an awd iirc, my car is fwd. Would this be the issue? I can get bigger injectors as I've got a 15g on the way, but I want to make absolutely sure that's the solution and that up arrow has me doubting. the awd system in the early volvo's are basicly mechanical. the tcm wouldn't have to control anything in order for it to work. did you get the ecu from a 1998? there is a changeover at 1999 just so you know. powertrain has changed which means the systems have changed. injector size would not effect the operation of automatic transmission and the control system. the light shouldn't be related to the fuel trim codes. cheers! Link to comment Share on other sites More sharing options...
payableondeath6 Posted November 2, 2010 Author Report Share Posted November 2, 2010 Yes its from a 98. The up arrow only comes on when its about to die, so I'm not too terribly worried by it, though it doesn't come on at all with the old ecu. So no suggestions on what could be the problem? Link to comment Share on other sites More sharing options...
Reximus Posted November 2, 2010 Report Share Posted November 2, 2010 Yes its from a 98. The up arrow only comes on when its about to die, so I'm not too terribly worried by it, though it doesn't come on at all with the old ecu. So no suggestions on what could be the problem? is there anything you could do before the engine stalls with the V70R ecu? like giving some gas and stuff? cheers! Link to comment Share on other sites More sharing options...
payableondeath6 Posted November 2, 2010 Author Report Share Posted November 2, 2010 I can give it gas to keep it running but I didn't want to keep it going too long if it posed a threat to damaging something. If its safe I could try to keep it running for a couple minutes and see how it does. So any risk to keeping it running? Link to comment Share on other sites More sharing options...
Reximus Posted November 2, 2010 Report Share Posted November 2, 2010 I can give it gas to keep it running but I didn't want to keep it going too long if it posed a threat to damaging something. If its safe I could try to keep it running for a couple minutes and see how it does. So any risk to keeping it running? you can try this.... run the car warm like 10 min with your glt computer... once it's up to temp, shut it off and swap the V70R ecu into it. try to keep it idle... not too high, 1500 max.. as long as engine is not making any weird noise you should be fine... usually the computer goes into closed loop operation after a minute or two, after this the computer will adjust it's fuel trim to match the running condition. if you can have the idle last that long, it should be able to run after it trims itself out. the reason why it's so hard to keep it running with the V70R ecu is because the injector is about 25% smaller than the V70R, that is almost like a limit of what the computer could do for fuel trim before it will set a code. but it would be runnable after it adjust the fuel trim. a side note, did the IAC P0505 code set with the V70R ecu? cheers! Link to comment Share on other sites More sharing options...
payableondeath6 Posted November 2, 2010 Author Report Share Posted November 2, 2010 I will give your method a shot tomorrow. All the codes were with the old ecu. But I hadn't reset everything since installing all the new parts and after pulling the ecu it seems to have more go than before, makes me really hopeful that the v70r ecu will work. Link to comment Share on other sites More sharing options...
Reximus Posted November 2, 2010 Report Share Posted November 2, 2010 I will give your method a shot tomorrow. All the codes were with the old ecu. But I hadn't reset everything since installing all the new parts and after pulling the ecu it seems to have more go than before, makes me really hopeful that the v70r ecu will work. i could totally understand what you're feeling there... but i wouldn't leave the injector upgrade out of your list besides the turbo though. cheers! good luck! Link to comment Share on other sites More sharing options...
payableondeath6 Posted November 2, 2010 Author Report Share Posted November 2, 2010 i could totally understand what you're feeling there... but i wouldn't leave the injector upgrade out of your list besides the turbo though. cheers! good luck! What color injectors would I be looking for? I've heard lots of different colors referenced, I'm used to Fords where they were in pounds. Link to comment Share on other sites More sharing options...
payableondeath6 Posted November 2, 2010 Author Report Share Posted November 2, 2010 Well, I've replaced ALL of the vacuum hoses and any other underhood rubber hose. Car still idles rough (today seems rougher) so I didn't bother with the ECU. I've only got 3 ideas left before I give up (very frustrating): 1) I didn't replace the rubber o-rings on the injectors when I replaced the PCV system and pulled the injectors from the intake manifold, so I'll replace them with new 2) I have a used (with less mileage) IAC valve coming in the mail to see if that will help with the rough idle 3) I'm going to get some Bosch copper plugs to replace these NGK Iridiums that everyone seems to doubt Any and all ideas are welcome, like I said I'm frustrated. I called the local Volvo dealer and it's $75 for the diagnostic service, maybe that will tell me more?? Anyone think so? Link to comment Share on other sites More sharing options...
GltGreco Posted November 2, 2010 Report Share Posted November 2, 2010 I have ran my glt with both t5 and R ecus, and i can say that when we did my turbo swap it was apparent that I was running quite lean, this could be part of the issue. Also when i first swapped to the t5 ecu it did seem to run a little rougher at first, but it seemed to adjust. I would def. still keep your injector swap plan alive, especially if your upgrading to a bigger turbo as well. I cant really tell from your posts, but to what extent have you used the r ecu, have you given it time to try and adjust or no? also copper plugs should help as well. Link to comment Share on other sites More sharing options...
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