oleskooljoker

ok first my car is a 2000 em1 with the original b16a2, 142,500 miles. i put my exhaust on it about 2 weeks ago and about 2-3 days after installing the system i started hearing the exhaust pop while accelerating or under load but when let off it doesnt pop. meanwhile before it didnt "pop" with the old system. the car came with a gutted cat (still on the car) which i am putting a megan "high flow cat" resonater in a few days. yes the check engine light is on. its for misfireing which i still havent figured that out yet. also has a very lumpy idle. any advice???

it has:
-dc header
-aem short ram intake
-srs 2.25 catback exhaust
-everything else is stock

i have already changed the plugs, wires, cap, rotor, ignition coil, pcv valve, cleaned the iac valve, fuel filter.
i know i should throw the car away but i want to try and keep it for awhile lol

im just trying to get this best idea to just tackle it right away for not a lot of money.

thanks

Dc4LsTeG

iTrader: (7)

What do you mean pop? Like a backfire?

Former User

Reset the ECU and if the CEL turns on again, pull the code(s) and post it.

oleskooljoker

yeah i guess you can call it that but is doesnt backfire when i let off with the clutch still engaged

ill do that tomorrow when i get off work

Wrona

is your car running rich? thats what happened to me when my car was it was unburnt fuel in my system that made it pop added some BG44K put some shell gas in it did my tune up after i drove all the gas out filled it up all the way and let my car sit without the battery for a night because i threw it on the charger doesnt do it since

oleskooljoker

as of right now i dont know. i have to find someone with a fuel pressure gauge and see what pressure it is

EsotericImage

iTrader: (8)

just buy one.. theyre cheap and sits right on the fuel filter.. 35-40 bucks

oleskooljoker

yeah i know im going to get one soon

EsotericImage

iTrader: (8)

did you put the distrib back in the same spot? im thinking a timing issue.

what coil did u use?

oleskooljoker

i didnt take the distributor out to change the coil. i bought an oe replacement coil...

EsotericImage

iTrader: (8)

hmm.... this is quite vexing.

try wrona's fix and come back to us

oleskooljoker

you got it

Former User

Misfiring can cause the problem you're having. Again, reset the ECU and post any codes that pop up afterwards.

oleskooljoker

i will

oleskooljoker

ok pulled the codes,
p0302-cyl. 2 misfire
p0303-cyl. 3 misfire
p0304-cyl. 4 misfire
p0113-air intake temp sensor
p0300-random misfire
p1399-multiple/random misfire

Former User

Is this^ after resetting the ECU?

-Measure the fuel pressure and test the FPR.
-Unplug the primary O2 sensor to see whether the problem goes away.
-Test the ICM.
-Compression test the cylinders.
-Check whether the IAT is unplugged.

oleskooljoker

i will be ordering a fuel pressure guage in a few days so ill let you know on that one. how do i test the FPR?
the one before the cat right? just a double check
will do that tomorrow
ill do that when ever i can get a chance and when i find someone to do it for cheap
yep its plugged in

oleskooljoker

oh and yes that was after reseting the ECU

Former User

In section 5k of the FAQs sticky, you'll find a diagram for measuring the fuel pressure. Testing the FPR is done in conjunction with the fuel pressure measurement (see diagram).

O2 sensor before cat.

Have an auto parts store test the ICM.

You may be able to rent a cylinder compression tester and fuel pressure tester from an auto parts store.

oleskooljoker

ok sweet ill try to do most of this in the days to come. thanks for posting really quick. but how long do i drive with the o2 sensor unplugged?

Former User

You should see an effect after the engine is fully warmed up, if the O2 sensor is the problem

oleskooljoker

Ok will do. Appreciate it

oleskooljoker

well with a little update of what time i had i pulled the plugs. from left to right (distributor to the timing belt) im guessing #4 cylinder at the far left had carbon build up all on it.

grumblemarc

iTrader: (4)

??? Did you do anything that you said you were going to?

oleskooljoker

no i couldnt. im trying to get to do whatever i can do the quickest i can. i get home from work at night late. whenever i have the best amount of time ill do whatever what was asked