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Car Forum / GMC Cars / January 20051995 3.4L DOHC PCM (was: Cylinder No.5 not firing)
So I found out why cylinder number 5 wasn't firing and I temporarily fixed by soldering a new leg onto the number 5 injector driver transistor. I need a permanent solution. Electronic stores can't seem to cross reference the number, junk yards are telling me $100 weather the PCM works or not and the dealership won't sell units that have been replaced. I have a local garage keeping an eye out for one, I just have to pay the $10 they get for the core, but that could take a while. What can I do? Anyone know of a suitable replacement? 9707 T(arrow pointing down with line under it)R9502 <---- I'm assuming this is the date code A 3M Steve Through some internet research I just found out that this transistor I'm looking for is a Metal-Oxide, Single-Gate transistor. Does this help anyone help me? Steve > So I found out why cylinder number 5 wasn't firing and I temporarily fixed > by soldering a new leg onto the number 5 injector driver transistor. I [quoted text clipped - 10 lines] > the date code > A 3M >> 9707 >> T(arrow pointing down with line under it)R9502 <---- I'm assuming this >> is the date code >> A 3M More research has shown me that the "T(arrow pointing down with line under it)R" is actually "I(diode symbol)R", standing for International Rectifier, the manufacturer. Now I'm a little closer. Steve > More research has shown me that the "T(arrow pointing down with line under > it)R" is actually "I(diode symbol)R", standing for International > Rectifier, the manufacturer. Now I'm a little closer. Just got off the phone with IR, the part number is not in their system. They told me it must be a custom OEM component, figures. He gave me the tech support line phone number for Delco-Remy, I hope they are the people that made this PCM. Anyone know? Steve >>More research has shown me that the "T(arrow pointing down with line under >>it)R" is actually "I(diode symbol)R", standing for International [quoted text clipped - 6 lines] > > Steve Post this over in sci.electronics.repair, and sci.electronics. What you have is a house numbered transistor. there will be no listed cross. What you need to to is ID if its a PNP, NPN or a Mosfet. Then what type of package its in. A transistor substitution manual will be of help trying to ID the package type. From that information, someone can try to make a guestimate cross. If this drives the coil directly, it will be a higher current device. I am not sure in your case if it does. A DVM ohm meter with a diode check function will be of help in the ID. Bob > Post this over in sci.electronics.repair, and sci.electronics. > What you have is a house numbered transistor. there will be no [quoted text clipped - 5 lines] > > A DVM ohm meter with a diode check function will be of help in the ID. Thanks for the advice. I have determined that it is an N-Channel MOSFET in a TO220 case. Steve >>Post this over in sci.electronics.repair, and sci.electronics. >>What you have is a house numbered transistor. there will be no [quoted text clipped - 10 lines] > > Steve Maybe something like a IRFZ44 then? They are common in car stereo amps for power supply switchers. >> Thanks for the advice. I have determined that it is an N-Channel MOSFET >> in a TO220 case. >> > Maybe something like a IRFZ44 then? They are common in car stereo amps for > power supply switchers. What about an IRF3707? That is the one that I selected before we started this conversation. http://ec.irf.com/v6/en/US/adirect/ir?cmd=catProductDetailFrame&productID=IRF3707: Steve >>>Thanks for the advice. I have determined that it is an N-Channel MOSFET >>>in a TO220 case. [quoted text clipped - 7 lines] > > Steve You probably looked at these pages then: http://www.irf.com/product-info/auto/ignition.html http://www.irf.com/product-info/auto/fuelinjector.html Bob >>>Maybe something like a IRFZ44 then? They are common in car stereo amps >>>for power supply switchers. [quoted text clipped - 8 lines] > > http://www.irf.com/product-info/auto/fuelinjector.html No I haven't seen those. Never saw that page on the IR website. Thanks. How do I know for sure which one is best for me? If I find a good replacement I will replace all 6 drivers. If I just measure the resistance of my injector coils and then select one that way? Steve Nevermind, there are only 2 to choose from apparently. The IRLZ44N and the IRLZ44NV, and it appears the IRLZ44NV doesn't exist, so there is only one choice. Steve >>>>Maybe something like a IRFZ44 then? They are common in car stereo amps >>>>for power supply switchers. [quoted text clipped - 7 lines] > replacement I will replace all 6 drivers. If I just measure the resistance > of my injector coils and then select one that way? |
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