Dead Injector Bank
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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1954 Cadillac
- MegaSquirt Newbie
- Posts: 2
- Joined: Sat Jun 21, 2008 1:30 pm
Dead Injector Bank
I have an odd problem. I am running a Megasquirt II v3 with a relay board running 8.86 code. Bank 1 of my injectors gets no gas. I can get the car to start on 4 cylinders using bank 2. The car is a 472 Cadillac V8 with a 1975 Cadillac port injection manifold. It has low impedance F2 (factory) injectors. I am using an HEI with vacuum advance. The Megasquirt only controls the FI. I recently built the Megasquirt but bought a preassembled relay board. I can not figure out what could cause 1 bank of injectors not to fire. I initially had an alternating injector sequence. Then I tried simulaneous, no change. I noticed the R15 0n my Megasquirt board looked burned. It was the only component burned. I replaced it with another 22 ohm resistor. The original burned resistor measured 23 ohms. So I don't suspect that this resistor was causing a problem. The spark plugs on Bank 1 are still clean. The bank 2 plugs are wet .Has anyone had this issue or does this ring any bells as to what would cause 1 bank to not work ? BTW, the fuses are all good. Thanks. Dan
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1954 Cadillac
- MegaSquirt Newbie
- Posts: 2
- Joined: Sat Jun 21, 2008 1:30 pm
Re: Dead Injector Bank
Hi Lance, thanks for the quick response. For starters I am running the 2.886 code. (I am getting confused with multiple IOSs that I deal with on a daily basis with my job !) As for Q9 and Q 3 - I have infinite resistance (no continuity) between the mounting tab and the heatsink. At time of assembly I did have the 60k ohm resistance without any modifications.One thing I did notice is that Q14 has continuity between 2 of the pins, the center pin and the pin that is nearest the rs232 connector. I scraped the area between the pins. I put the computer in the car again and noticed the voltage on bank 1. I started the car and it works ! Thanks for helping out. I lightly burned my finger in bank 1's header tube ! yeah baby !!!! Now to stop it from running rich ! Dan