Well if its miss firing then it has to do a lot with the spark plugs but alot of people make the mistake to just clean them or put in new ones u have to also buy brand new spark plug wires not only that but also the coil it has to do to much with it without the coil it doesnt send the spark threw the spark plug wires to spark the spark plugs change it all...the second thing with lack of power involves the fuel filter if its dirty the gas isnt going to pass threw the correct way causing it to not start, lagginngg to start, and lacking power cause of lacking fuel to combustion and maintaining it to run with power..the third thing i would check and change if still causeing problems is the injectors they get clogged up no fuel passing threw them aswell there not spraying properly so therefore lack of power or not starting ..are u smelling gas? if u are one of ur fuel lines is dripping it will cause it not to start if it gets to big could cause lack of power..weak battery?? check it buy a cheap muti meter put the negative on negative terminal of battery n postive on positve while car off it should read 12 v cause its a 12 v battery if less means battery is weak going bad so laack of power then turn it on it should read over 12v around 13 or 14 if so means the alternators working good and charging battery cause a weak alternator or one that is goin bad cause lack of power as well i know this is a lot to read lol but heyyyy its good knowledge if u dont no hope this helps if u have any questions email me if u like at fcarsherry@yahoo.com

Answered by autoscanner
0 questions asked

There are a few things to do to when trying to diagnose a misfire. All vehicles are different, but there are a few places to start.
1) If possible use an auto scanner on newer vehicles. The misfire counter function can help you determine which cylinder is behaving badly. Clearly this is not an option for all people and vehicles though. Fcar F3-W is an advanced auto scanner.It can diagnose all kinds of petrol control systems quickly and easily,and it Supported Nissan.
more for Fcar F3-W:
http://www.fcardiagnostictools.com/obd2/1-f3-w-world-cars.html

Answered by autoscanner
0 questions asked

have you done anything else besides the cold air and exhaust???

the downstream is not needed now as its only job was to monitor the cat converter. does not effect the running of the car.

i would go back to basics as drag racing the car may have damaged something internal.

start with a compression test, fuel pressure test

Roy

Answered by ASEMaster6371 (expert)
24,845 answers provided

thanks for you advise,helps me a lot.

Response from tinatu1
2 questions asked

The problem with the car may not be what you think. Most of such cases are due to lack of compatibility of exhaust systems and the car engine. Yes, you may have acquired the car with the exhaust in talk at ago, but the fact is that it never works for all the sames well. You need to check how the two components are performing so as to find out what exactly might be the problem.

Answered by snikrepn
2 questions asked

The problem with the car may not be what you think. Most of such cases are due to lack of compatibility of exhaust systems and the car engine. Yes, you may have acquired the car with the exhaust in talk at ago, but the fact is that it never works for all the sames well. You need to check how the two components are performing so as to find out what exactly might be the problem. If you may need more information on exhaust systems, please visit the below link. It will help you even though it is for motorbikes. Exhaust performance is the same whether for cars or bikes, so get to visit the site
http://4wheelonline.com/StreetBikes/Street_Bike_Exhaust.103664

Answered by snikrepn
2 questions asked