my friend was on the highway in high rpm probably around 5k and he accidently down shifted to 3rd instead of 5th and now the car has a really bad mis, what can be the problem?

 

Spark plugs fouled, cap and/ or rotor burnt, distributor a little shaken. Once about ten years ago I wnet from 5th to 1st, meaning I was shooting for 3rd on deceleration. I lost my tranny. Jsut be glad it was nothing serious.

 

what rpm did he hit when he down shifted? hopefuly you just blew off a plug wire off the cap. worst case scenario you have a bent valve/valves.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SlowAzEg &raquo;</TD></TR><TR><TD CLASS="quote">what rpm did he hit when he down shifted? hopefuly you just blew off a plug wire off the cap. worst case scenario you have a bent valve/valves.</TD></TR></TABLE>

he was at around 5-5.5k rpm when he shifted, checked the plugs and # 1 have some oil deposits on it the rest are fine. all the wires were on good also. i cn hear a tapping in the motor though. is there a way to check if any valves are bent/broken without taking off the head?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1sikhatch &raquo;</TD></TR><TR><TD CLASS="quote">

he was at around 5-5.5k rpm when he shifted, checked the plugs and # 1 have some oil deposits on it the rest are fine. all the wires were on good also. i cn hear a tapping in the motor though. is there a way to check if any valves are bent/broken without taking off the head?</TD></TR></TABLE>

oil on plug could mean a bad ring in that cyl compression test is your best friend rite now

 

ok did the compression test and the results are (1-4) 30 135 135 130

 

Ouch, if that isn't a typo, #1 cyl probably had a valve meet the piston. Pull the head man.