2007 Hino 258 idles great as soon as you give it throttle is starts to misfire. Has been to the local dealer, they replaced the egr valve, svt solenoid, brake switch, and determined there is a bad splice some where in the harness and did an overlay to get good power to the circuits for vnt, egr and brake switch ( there words on the invoice) which infact did not fix the issue. I have dropped the tank and had it dipped, replaced the fuel filter, fuel sight glass do to some leaking, fuel rail pressure sensor, and fuel pressure sensor, same issue as before. An online Hino dealer stated that the injection timing may need adjusted but can not give me the process of how to do this or if infact this will fix the truck. I have no check engine light on, and scanner will not communicate with the ecu
2007 Hino 258 misfire under acceleration
- Thread starter jeff91069
- Start date
Did this happen all of a sudden or did these symptoms coincide with some event?
FYI, engine data is pulled from the 16 pin connector. I don't know what scan tool you're using, or whether it's compatible.
The injection timing is not adjustable.
If you disconnect the mass airflow sensor does it run any better?
FYI, engine data is pulled from the 16 pin connector. I don't know what scan tool you're using, or whether it's compatible.
The injection timing is not adjustable.
If you disconnect the mass airflow sensor does it run any better?
Last edited:
This has been an on going issue that would happen every couple hundred miles, then every 100 miles, no it is instantly as soon as you give it throttle. From what I have read from your posts, I do not think my scanner is compatible with Hino, it is for HD trucks but not working.
A scan tool with live data may be essential for fixing this. I'll continue to think about it.
Had anything been done to the truck before the problem first started?
Had anything been done to the truck before the problem first started?
Is it drivable at all, or does it make zero power?
Uo101 doesn't mean anything if it's inactive.
P0102 and P0113 were set when you unplugged the MAF sensor.
P0183 is the fuel temp sensor on the fuel pump. The sensor pretty much never goes bad, so I'd suspect wiring. This will cause limp mode.
P0193 is the common rail fuel pressure sensor high input. Once again I wouldn't suspect the sensor itself. Give the connector a wiggle with it idling. If it starts cackling and stumbling you need a connector. Will cause limp mode.
P0628 is a scv malfunction. That's the fuel pressure regulator on top of the fuel pump. This could range from electrical problems to the pump dying.
P2122, P2120, and P2127 all have to do with the accelerator pedal sensor.
P0405 is the EGR valve lift sensor.
It's pretty unlikely that all of these are valid codes. Many were probably set when sensors were unplugged. I'd have a look in the firewall junction box behind the air filter for corrosion, and check the rail pressure sensor and scv for good connections first.
P0102 and P0113 were set when you unplugged the MAF sensor.
P0183 is the fuel temp sensor on the fuel pump. The sensor pretty much never goes bad, so I'd suspect wiring. This will cause limp mode.
P0193 is the common rail fuel pressure sensor high input. Once again I wouldn't suspect the sensor itself. Give the connector a wiggle with it idling. If it starts cackling and stumbling you need a connector. Will cause limp mode.
P0628 is a scv malfunction. That's the fuel pressure regulator on top of the fuel pump. This could range from electrical problems to the pump dying.
P2122, P2120, and P2127 all have to do with the accelerator pedal sensor.
P0405 is the EGR valve lift sensor.
It's pretty unlikely that all of these are valid codes. Many were probably set when sensors were unplugged. I'd have a look in the firewall junction box behind the air filter for corrosion, and check the rail pressure sensor and scv for good connections first.
The truck keeps getting worse now it will not start on its own, have to use starting fluid to get it start, it will run smooth until yu give it gas then starts to misfire, the more you try to give it gas it seems like the more it starts to misfire. Do you think we are looking at a bad injection pump?
Get it started and start wiggling connectors. A bad connection at the common rail pressure sensor can cause some misfire symptoms. Scv too.
I don't like telling people to buy thousands of dollars of parts on a guess.
I don't like telling people to buy thousands of dollars of parts on a guess.
Get the junction box open and connectors apart. Look for corrosion
The firewall one. It looks pretty good in there.
Does disconnecting the scv make a difference in how it runs? In theory it should still run when disconnected, just badly. The best way to tell if it's bad is to watch it's performance using DX.
P0193 in Isuzu literature describes it as a large leak (I think). Remove the banjo bolt from the rail pressure limiter. It's the small line at the front of the common rail. Plug the line. I usually just use a M8 bolt and nut and the existing seal washer to close the line. Stick a plastic bottle or something over the rail limiter and try to drive it. Basically no fuel should escape.
Since we're grasping at straws, remove the injection lines and flow dampers from the common rail and look for debris. I've seen pieces of a failing pump clog the flow dampers. I've also seen debris from the pump get caught in the inlet of the common rail. You'll have to remove the line between the pump outlet and common rail.
Does disconnecting the scv make a difference in how it runs? In theory it should still run when disconnected, just badly. The best way to tell if it's bad is to watch it's performance using DX.
P0193 in Isuzu literature describes it as a large leak (I think). Remove the banjo bolt from the rail pressure limiter. It's the small line at the front of the common rail. Plug the line. I usually just use a M8 bolt and nut and the existing seal washer to close the line. Stick a plastic bottle or something over the rail limiter and try to drive it. Basically no fuel should escape.
Since we're grasping at straws, remove the injection lines and flow dampers from the common rail and look for debris. I've seen pieces of a failing pump clog the flow dampers. I've also seen debris from the pump get caught in the inlet of the common rail. You'll have to remove the line between the pump outlet and common rail.
The steel tanks on these trucks are a constant source of rust chunks and other junk. I don't know how this got past the fuel filter. I don't think this enough to seriously restrict fuel flow. If it was it'd set P0087, P0088, or possibly both.
I'd remove the flow dampers and fuel supply line from the common rail and look for metal. There's a spring in the injection pump that breaks, gets chopped up, and will clog the dampers.
I'd remove the flow dampers and fuel supply line from the common rail and look for metal. There's a spring in the injection pump that breaks, gets chopped up, and will clog the dampers.
Well found this morning that one of the new dampers that we put in is stuck closed, only 5 days old, but do not see any metal pieces