Excel miss
Hi,
I have an Australian Excel, 1998, manual, 1.5L DOHC, 150,000km. For a while now it has a miss on acceleration, clears up above 1800~2000 revs. Checked the engine codes 4444 (all clear). (Pre OBD2) Had new plugs fitted, and the injectors serviced, made no difference. Checked the coil pack resistance, manual says should be ~500 ohms for twin cam or ~.5 ohms for single cam. Mine actually measures 1 ohm. My wife has a similar model so checked the coil in that, measures same as mine, hers runs well. What could cause this problem and not show up as an ECU code? TIA Wayne H. |
Re: Excel miss
Wayne H wrote:
> Hi, > I have an Australian Excel, 1998, manual, 1.5L DOHC, 150,000km. > For a while now it has a miss on acceleration, clears up above 1800~2000 > revs. > Checked the engine codes 4444 (all clear). (Pre OBD2) > Had new plugs fitted, and the injectors serviced, made no difference. > Checked the coil pack resistance, manual says should be ~500 ohms for twin > cam or ~.5 ohms for single cam. Mine actually measures 1 ohm. My wife has a > similar model so checked the coil in that, measures same as mine, hers runs > well. > What could cause this problem and not show up as an ECU code? > TIA > Wayne H. Did you replace the spark plug wires? They're more likely to be the cause than plugs or coil packs. |
Re: Excel miss
"Brian Nystrom" <brian.nystrom@verizon.net> wrote in message news:scoSi.244$aB2.196@trndny07... > Wayne H wrote: >> Hi, >> I have an Australian Excel, 1998, manual, 1.5L DOHC, 150,000km. > > Did you replace the spark plug wires? They're more likely to be the cause > than plugs or coil packs. Concur. Had a similar problem on another car. Given the age, change the wires no matter how good they look visually. |
Re: Excel miss
On Oct 20, 2:58 am, "Wayne H" <wayneh1...@optusnet.com.au> wrote:
> Hi, > I have an Australian Excel, 1998, manual, 1.5L DOHC, 150,000km. > For a while now it has a miss on acceleration, clears up above 1800~2000 > revs. resistance of each spark plug wire should be checked w/ ohm meter all the same? check compression after engine warms up. leaking/ stuck exhaust valve? compression leak? check static valve clearance? |
Re: Excel miss
"Edwin Pawlowski" <esp@snet.net> wrote in message news:8LoSi.59113$Um6.54053@newssvr12.news.prodigy. net... > > "Brian Nystrom" <brian.nystrom@verizon.net> wrote in message > news:scoSi.244$aB2.196@trndny07... >> Wayne H wrote: >>> Hi, >>> I have an Australian Excel, 1998, manual, 1.5L DOHC, 150,000km. > >> >> Did you replace the spark plug wires? They're more likely to be the cause >> than plugs or coil packs. > > Concur. Had a similar problem on another car. Given the age, change the > wires no matter how good they look visually. > Thanks for the replies, I did measure the resistance and they all seemed ok, maybe breaking down under load. Will get another set of leads tomorrow and try that, hopefully it will fix the problem. Wayne H. |
Re: Excel miss
"mykey" <mykeymykey01@yahoo.com> wrote in message news:1192900327.004235.249050@i13g2000prf.googlegr oups.com... > On Oct 20, 2:58 am, "Wayne H" <wayneh1...@optusnet.com.au> wrote: >> Hi, >> I have an Australian Excel, 1998, manual, 1.5L DOHC, 150,000km. >> For a while now it has a miss on acceleration, clears up above 1800~2000 >> revs. > > resistance of each spark plug wire should be checked w/ ohm meter > all the same? check compression after engine warms up. > leaking/ stuck exhaust valve? compression leak? > check static valve clearance? > Success!! but not quite what I expected. Had a thought, & decided to change over the ignition leads from my wifes car, made no difference. As I'd got that far and against the general opinion of the group I decided to try changing the coil pack over as well. - Ran like a dream, better than it had in over 12 months. Put my coil in wifes car, ran like a dog. Going out tomorrow to buy myself a new coil. Thanks to all for your advice, fortunately the motor wasn't making expensive noises ( burnt valves etc) Wayne H. |
Re: Excel miss
I run a fleet of hyundais too!
Sure helps problem solving Norm Wayne H wrote in message <471dba72$0$20739$afc38c87@news.optusnet.com.au>.. . > >"mykey" <mykeymykey01@yahoo.com> wrote in message >news:1192900327.004235.249050@i13g2000prf.googleg roups.com... >> On Oct 20, 2:58 am, "Wayne H" <wayneh1...@optusnet.com.au> wrote: >>> Hi, >>> I have an Australian Excel, 1998, manual, 1.5L DOHC, 150,000km. >>> For a while now it has a miss on acceleration, clears up above 1800~2000 >>> revs. >> >> resistance of each spark plug wire should be checked w/ ohm meter >> all the same? check compression after engine warms up. >> leaking/ stuck exhaust valve? compression leak? >> check static valve clearance? >> > >Success!! but not quite what I expected. >Had a thought, & decided to change over the ignition leads from my wifes >car, made no difference. >As I'd got that far and against the general opinion of the group I decided >to try changing the coil pack over as well. - Ran like a dream, better than >it had in over 12 months. >Put my coil in wifes car, ran like a dog. > > Going out tomorrow to buy myself a new coil. > >Thanks to all for your advice, fortunately the motor wasn't making expensive >noises ( burnt valves etc) > >Wayne H. > > > |
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