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I think most owners with a honda will have suffered this by now due to the age of our cars.
(noticed that inbox I never checked for so long is full.. and one of the interesting questions that came up is jerking issue.
Even I suffered this problem a few times, with different cars.
Normally, people will check fuel relay first. Which is right.
If it's not problem with the fuel system, they'll suggest to change the distributor.. then after chang distributor also problem, then that's where most workshops are stuck at troubleshooting.
So here's a question you need to answer first to identify the problem (after you confirm that it's not the fuel pump/distributor issue!)
*Does the jerking happen at low throttle positions (at 10-20% throttle?)
If yes, check the TPS voltage. This is easy if you have datalogging systems like hondata. Show me the graph of the TPS when the jerk happens and the problem is easily identified. Also check if the TPS does not have blank spots where it shows 0 Volts, if got, time to replace. if not, just set it to 0.5-0.6V fully closed. Don't use the ohm method to set TPS, this doesn't work for old TPS, only for NEW
The reason this happens is due to the DFCO function in all modern ecus.. detect 0% TPS, cut off injectors. In our case, the above is based on finding out that the DFCO kicks in by detecting 0% throttle. That's why look for 0% throttle in the datalog.
*DFCO - Deceleration Fuel Cut Off.
Does the jerking happen randomly? sometimes low, sometimes high?
*Check the main relay. Either fix or replace. This is not so common, but can cause intermmittent power to be sent to the ECU.. this one I spent almost 2 months to troubleshoot for my car, because never suspected the main relay, and the problem happens like once or twice a week. (Took the main relay, replaced, ambik kereta gelek2 that relay sampai hancur untuk puaskan hati.. lol.. )
Another would be misfiring/knock retard, but that doesn't happen very commonly, as it is caused usually by improper tune/distributor problem/sensor issue.. This also easily identifiable if you datalog the jerk. This is rare though.
*note that this assumes all wiring connetions are OKAY..The above problems can also be caused my loose/spoilt wiring for the related sensors.
(noticed that inbox I never checked for so long is full.. and one of the interesting questions that came up is jerking issue.
Even I suffered this problem a few times, with different cars.
Normally, people will check fuel relay first. Which is right.
If it's not problem with the fuel system, they'll suggest to change the distributor.. then after chang distributor also problem, then that's where most workshops are stuck at troubleshooting.
So here's a question you need to answer first to identify the problem (after you confirm that it's not the fuel pump/distributor issue!)
*Does the jerking happen at low throttle positions (at 10-20% throttle?)
If yes, check the TPS voltage. This is easy if you have datalogging systems like hondata. Show me the graph of the TPS when the jerk happens and the problem is easily identified. Also check if the TPS does not have blank spots where it shows 0 Volts, if got, time to replace. if not, just set it to 0.5-0.6V fully closed. Don't use the ohm method to set TPS, this doesn't work for old TPS, only for NEW
The reason this happens is due to the DFCO function in all modern ecus.. detect 0% TPS, cut off injectors. In our case, the above is based on finding out that the DFCO kicks in by detecting 0% throttle. That's why look for 0% throttle in the datalog.
*DFCO - Deceleration Fuel Cut Off.
Does the jerking happen randomly? sometimes low, sometimes high?
*Check the main relay. Either fix or replace. This is not so common, but can cause intermmittent power to be sent to the ECU.. this one I spent almost 2 months to troubleshoot for my car, because never suspected the main relay, and the problem happens like once or twice a week. (Took the main relay, replaced, ambik kereta gelek2 that relay sampai hancur untuk puaskan hati.. lol.. )
Another would be misfiring/knock retard, but that doesn't happen very commonly, as it is caused usually by improper tune/distributor problem/sensor issue.. This also easily identifiable if you datalog the jerk. This is rare though.
*note that this assumes all wiring connetions are OKAY..The above problems can also be caused my loose/spoilt wiring for the related sensors.
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