CMF_Daniel
» CMF Member
Hi, my name is Daniel and i havent posted on here for years.
My micra has been running really well ever since I bought it (second hand) more than 3 years ago and just recently it hasnt been running too well.
It runns perfectly normal from idle to about 1500rpm and prefectly normal from about 2500rpm upwards. From 1500-2500rpm it seems to lack power.
Say I am driving along a flat road in 4th gear revving around 2000prm and hit a bit of a hill, the car starts to shudder (like it would if it was revving at about 500-600rpm in first grear in a carpark). To stop the shudder I can either change down to third gear and rev it up to the higher 2000's or change to fifth gear to rev in the low 1000's.
To me this is strange, I have replace the fuel filter, spark plugs, air filter, cleaned out the distributer cap and rotor arm, bled the solders in the throttle body, run optimax with injector cleaner all to no avail.
I thought it may be the HT leads. The haynes manual says that the HT leads should have resistance of 4.48-6.72K ohms per meter. I am not sure if this is just the actual lead or if you are supposed to include the solid part that goes to the spark plug. the length of the sparkplug holder is about 13cm. I have included resistances of my HT leads and calculated values from the haynes book.
# length actual calculated calculated including holder
1 50cm 3.6kohm 2.24-3.36kohm 2.82-4.23kohm
2 46cm 3.2kohm 2.06-3.10kohm 2.64-3.96kohm
3 30cm 2.4kohm 1.34-2.02kohm 1.93-2.89kohm
4 25cm 2.7kohm 1.12-1.68kohm 1.70-2.55kohm
Do you think that reaplacing the HT leads would fix my problem? replacing the distributor ar and rotor arm? the distributor car and rotor arm and the spring leaded thing in the cap all seemed in very good condition.
I have also done the computer's self diagnostics and it returned no faults.
I am stumped... what do you thnk about the HT leads? change them and hope for the best?
Daniel
My micra has been running really well ever since I bought it (second hand) more than 3 years ago and just recently it hasnt been running too well.
It runns perfectly normal from idle to about 1500rpm and prefectly normal from about 2500rpm upwards. From 1500-2500rpm it seems to lack power.
Say I am driving along a flat road in 4th gear revving around 2000prm and hit a bit of a hill, the car starts to shudder (like it would if it was revving at about 500-600rpm in first grear in a carpark). To stop the shudder I can either change down to third gear and rev it up to the higher 2000's or change to fifth gear to rev in the low 1000's.
To me this is strange, I have replace the fuel filter, spark plugs, air filter, cleaned out the distributer cap and rotor arm, bled the solders in the throttle body, run optimax with injector cleaner all to no avail.
I thought it may be the HT leads. The haynes manual says that the HT leads should have resistance of 4.48-6.72K ohms per meter. I am not sure if this is just the actual lead or if you are supposed to include the solid part that goes to the spark plug. the length of the sparkplug holder is about 13cm. I have included resistances of my HT leads and calculated values from the haynes book.
# length actual calculated calculated including holder
1 50cm 3.6kohm 2.24-3.36kohm 2.82-4.23kohm
2 46cm 3.2kohm 2.06-3.10kohm 2.64-3.96kohm
3 30cm 2.4kohm 1.34-2.02kohm 1.93-2.89kohm
4 25cm 2.7kohm 1.12-1.68kohm 1.70-2.55kohm
Do you think that reaplacing the HT leads would fix my problem? replacing the distributor ar and rotor arm? the distributor car and rotor arm and the spring leaded thing in the cap all seemed in very good condition.
I have also done the computer's self diagnostics and it returned no faults.
I am stumped... what do you thnk about the HT leads? change them and hope for the best?
Daniel
