JDM B18C struggling and little backfire

**zropts** · 14-09-2010 04:46 PM

Hi,

My car with B18C is currently stuggling (kinda choking splut splut splut etc. noise from the engine & exhaust on cold start up) when I change gears from 2nd to third, or third to fourth etc before 3000rpms and struggles 3-4 times more than before. After 3000-4000rpms, car seems to pick up again. Sounds kinda like a bad air/fuel mixture, bad tuned car or car with harder cams. This is usually a smooth gear change & a smooth ride but now a disaster. You can also hear the exhaust choking a tiny bit (not running smooth like before) and the whole car wobbles a little when doing the gear changes. Idle is smooth and stays constant and NOT reving all over the place. Well some mechanics has said that if its electrical, the car wont start (not sure if its electrical).

VTEC is ok. No CEL values.

Since this, I have changed:

Spark Plugs - bought new spark plugs - no difference
Spark Leads - tested with a mates NGK spark leads - no difference
Changed to Walbro Fuel Pump - no difference
Change fuel tank - air gunned fuel line from fuel tank to fuel filter to clean rust particles- no difference
Change to new Oil Filter - no difference
inspected and tested Distributor - tested to OEM manual specs (ICM etc) - no difference
New Toda Timing belt set correct - timing set when engine was out. - no deifference
Change New Fuel Filter - no difference
Change/flush Honda FEO Motor oil - no difference

All fuses checked (underdash & under bonnet) - All working order

What else could be the problem?

O2 Sensor?
Coolant Sensor?
Clogged up injectors?
Fuel Pressue regulator faulty?
TPS?
FITV?

**VTec1987** · 14-09-2010 09:47 PM

post up a video of the engine on idle.

could be anything, video of the car running would help

**SiReal** · 14-09-2010 09:49 PM

sure its not a blocked exhaust system? CAT might be screwed up. Swap it with a mate and test that.?

**zropts** · 15-09-2010 09:04 AM

I got JDM Cat. If the cat is stuffed up, what am I looking for? Will change and let you know.

**Bludger** · 15-09-2010 10:04 AM

clogged injectors is a possibility.

very hard to diagnose, vid is best

**MM89** · 15-09-2010 10:31 PM

this is the exact same situation i'm in at the moment..the car is quite thirsty as well.

happened to me after i cleaned IACV, adjusted TPS (shouldn't have done this if i knew s300 could control it.....)

also cold starts are wierd...revs up to 2,000rpm immediately and within 10 seconds returns to a 1100rpm idle until it warms up.
idle can be quite inconsistent and after a period of start and stop driving, the idle begins to rise a little above 1000rpm upon coming to a full top.
it may even hunt around for a little bit. i'm assuming i may have stuffed the IACV?

**zropts** · 16-09-2010 10:11 AM

What I'll be doing is check my CAT, buying TPS & get RC 240CC fuel injectors and diagnose this problem one by one to find the real problem. Really doing my head in atm. Wil let you know once I find the problem.

**Bludger** · 16-09-2010 10:49 AM

bad fuel is another.

actually can you please detail what you've done.....

not just short list.

**Alexplicit** · 16-09-2010 10:51 AM

tried swearing at it? kicking the tyre? giving it evils? "puttin the staunch on it"?

did u do any mods to the car before it happened? touch anythin under the bonnet around the same time it started doing it?

**Tai** · 16-09-2010 10:52 AM

Was anything done to the car prior to this happening?

**zropts** · 16-09-2010 10:55 AM

Nothing was done. But I did find out the fuel tank was corroded "after" this was happening thus having to change the fuel tank, fuel pump & bracket and replacing the clogged fuel filter. Would it be possible for the tiny rust particles to travel past the fuel filter and into the injectors?