Recent content by dbrannon79

If you have it up on a lift, have the fella check over all the joints. tie rods, ball joints, pitman and idler arms. also check the steering shaft coupling too. it's the rubber joint that is between the steering shaft and the gear box. those wear out and is sometimes the source of a sloppy...

Making more sense... I redid the calculations but I went online and calculated the engine displacement figure since it was rebuilt and bored .030 over. that actually makes this engine from a 250 to a 258.8ci displacement. just by entering those numbers and leaving the fuel pressure alone...

When it was running extremely rich, I found these numbers in the tune file were up in the 190's though fuel pressure was the same. I have to remember that this tune is based from a GM 4.3l V6 and this is a 4.1 straight 6. iirc the 250 has a larger cylinder bore than the 4.3's and a lot more...

The thought just occurred to me about fueling on these OBD1 ECM's (this one is and old OBD1 system modified for on the fly tuning) that they all can compensate for a lean or rich condition to achieve the desired air fuel ratio when all sensors are functioning. they can make slight adjustments...

Here is all of the documentation I have on the EBL (embedded lockers flash) ECM that is on this truck. two of the links are to the wayback machine, I saved them as PDF files but they are too large to post here...

More documentation coming... I am compiling all the documents I have for this system that way it will be here available for others in need. some I have saved from the wayback machine since the site is no longer available. I am converting them into pdf documents so I can post them

it does. I was just reading the documentation for the ECM. here is a screenshot of the "accelerator pump" settings.

Nice! Yeah I wasn't thrilled about having those hoses under the intake ether!

Could that backfire also be a lack of fuel for sudden acceleration like on a carb when the accelerator pump isn't giving enough fuel?

I also failed to mention that when you rev the engine then let off, during the deceleration you can faintly hear a bu-bu-bump like it's lightly popping from the exhaust on decel. I am sure that also has to do with timing, but does not stumble at all though. other than doing a foot stomp from...

The ECM is also no longer reporting any spark knock from the knock sensor other than at crank time. I believe it's hearing the starter. it was explained to me that the knock sensor is basically a microphone mounted to the side of the block and listens for knocking. driving around today it...

There are variations in the ECM for things like coolant temps and if the knock sensor picks up knocks it retards the timing a bit, but for building a timing table for the ECM is not easy. it's way over my head! O2 still seems to function and read fine. I see the voltages on the live data...

For anyone that has dabbled with OBD1 and 2 and tuner pro for custom tunes here is the current spark advance timing table map and graph for this 250 engine. If someone sees something out of the norm for the spark advance for this engine let me know. I basically plotted it with the theory...

That inline fitting that @Will L. is talking about will fit in between the two in the second pic above. but it will make everything taller. you will also need to build a riser to lift the FFM up so the fuel hose can run over the top of the intake and have clearance to connect to the FFM, not...

Next is loading the parts cannon for a new fuel sending unit for the tank so we can get the tank back in the truck instead of running the 6 gallon boat tank LOL