Me78569

The ecm signal is dropping out for boost on the quad. The data log shows a drop out of no more htan 16 psi from where it was in the prior read. Is there ANYTHING other than the dodge ecm on that j1939 bus? How many map sensors do you have in your truck setup? Is the Ford ecm connected at all? the quadzilla is doing nothing in the code other than reading it from the bus and converting to psi. Have you tried reflashing the unit? In your above video I see your boost readings on the non quad screen read up to 30 psi, if that screen is actually reading map values, in PSI, from the output from the ecm then you would never see higher than 16 psi as the quadzilla is boost fooling. The ecm never sees higher than 16 psi period with a quadzilla attached. Something isn't right with what I am seeing.

if your friends tool doesn't pick anything up then I wouldn't worry about it. Drive it for a week then try the snap on again

is there an issue you are trying to solve?

Welcome to the forum,

jumper on is for 01/02 trucks pin off is for 98-00 trucks. Reason it builds steady with the jumper on is you are effectively removing the boost from the ecm. Do you have datalogs of the issue?

with the right tuner yes. I would figure out what you have for injectors before you do anything else.

you can do a boost leak test yourself. you can get better tuning yourself. The Edge is canned tunes. I would take the injectors out and get them tested to figure out what they are

Boost leak test. But the edge is pretty poor at controlling offidle fueling which results in smoke. better tuning

you dont need to see exact numbers, what you are looking for is it reads something steady at idle, then it increases with load to a poin that makes sense.

Probe the map sensor output wire, pin c of the sensor, using a multimeter at Idle state. The Sensor should be outputting near 4.5v. anything more than .25 less than that means your map sensor is reading boost at idle. If it reads .5v at idle then you will trip a code p0237, but if it reads ~4v-1v at idle then you will get this p0234 code. effectively means the map sensor is stuck reading a single psi reading and not functioning.

is your scan tool reading from the obd port or from the same plug under the hood that the quadzilla uses?

very true. follow the multimeter troubleshooting in the article it will tell you if the map is reading 0 psi at idle or if it is reading max at idle setting the p0234. unless you are driving WOT all the time then I would not expect an overboost code all the time just because of the elbow though.

have you looked at the troubleshooting article for that code? https://mopar1973man.com/cummins/articles.html/24-valve-2nd-generation_50/51_engine/obdii-error-codes_94/

Our trucks are fueled based on map input. A failed map will result in nearly no fuel.

Data log the issue please. If you are sub 16 psi then the quadzilla is simply passing through what the ecm is outputting on the data bus. If you have this issue sub 16 psi ever then the ecm is either not getting good signal from the map sensor or not outputting for some reason. The ecm output is always used so at 10 psi the quad is only getting boost from the ecm, but at say 20 psi then the quad is getting 16 psi from the ecm and 4 psi from the sensor. So if your map value is 28 then drops out it is very likely an issue with either the sensor or the wiring.

The quad is reading boost from the ecm from 0-16 psi above 16 psi it reads directly. If you are seeing jumping sub 16 psi then that is what the ECM is outputting on j1939 2 wire from the ecm for the Boost PID.

I doubt the 4 cyl vp talks in the same manner as the 6 cyl, but maybe.

It could have been. The flash doesnt support a specific tuning variable to work, it is a simple reuse of the boost limit variable. I should prob delete that flash as i dont think things are in place to use it anymore.

This change would be handled in the Json vehicle profile. I can't remember how I got around this in my testing. The staging flash was a beta / test thing.

Did you work with the directions in the quadzilla section?

Gear down and let it work. A stock truck was designed for the power you have. Dont expect it to more than it should, like tow hugely heavy at 65 mph uphill and you be fine. Replacing wear items like injectors is a good moveif you have a lot of miles on the truck. A new tc and vb would help put the power you do have down, but that is getting into expecting more than a stock truck can do. If the trans dies then do a decent build on the trans.

Did you follow the directions on page 1?

Tim, thanks for the help. We very much encourage you to jump in and share what you know. If you see something you know that isn't in the articles post it up so we can continue to build articles to help people. I know @Cowboy has a LOT of cool stuff for the ppump guys.,

I wouldn't worry about injectors. If you do anything buy a set of stockers for it. The DDP injectors will smoke worse than what you have now because they use the wrong spray angle. I would sell it as is. It's an old truck if the buyer walks because of that then whatever. The black smoke is likely a boost leak, or maybe worn injectors, but no towing wont wear injectors faster.

The phone is the only way to tune the quad. Download the app and play with it, it is free.