Fixed Idle Issue...Now car is skipping!! :(

[JohnL]

Ok dude i fixed it...the Lower port that i blocked went to the FITV. not the IACV. but i opened it back up and the thred seems to be a little damaged so this afternoon i went and picked up a new internal part from a wreck put it in screwed it up and DONE!! works.....1100RPM HEAVEN....

But now i have a different problem. i dont know if i've put my ECU out of wake but it seems to be spitting lots of fuel...running extremely ritch...to the point when if i put my throttle down more than 20% it will skip until i take my foot off the throttle...its defiantly drivable now but i cant put my foot down unless i take it easy and bring up the revs for a bit. I think its ECU but i dunno could be something random now

Progress! 1100rpm still seems a bit high, but way better than what you had before!

As to running rich, don't know why, sounds like a seperate problem. Maybe try resetting the ECU?

[B18cEG]

sounds like fuel issue possibly, on my civic (NA b18c engine) when i got it back from the repair shop they put the timing out by one tooth on the crank and it idled fine and sometimes drove fine, other times it would shoot 1 meter flames out the exhaust and rev like a pig and have NO power, just make shure it hasnt skiped a tooth on the belt (use timing light) other than that make sure you pluged everything back in (from experience lol) if all else fails it may be ecu related, did you change anything on the ecu? thats the only thing to think about

[aaronng]

Nah dude on idle its completely fine...its not Sparks or leeds if thats what your thinking.

Its just when im driving...If the car is in nutral i can rev it and it will be like normal but when im driving and turbo is spooling etc it will skip when i put the eccelerator down to much. almost JUMPY somtimes plus is has like NO POWER wat so ever

Make sure that the MAP sensor is plugged in properly and that you didn't accidentally knock it when you were taking the IACV out.

[JohnL]

As to running rich, don't know why, sounds like a seperate problem. Maybe try resetting the ECU?

Had a thought, try this; attached to the fuel rail there is a return valve that allows excess fuel pressure to bleed off back to the tank. It has a low pressure return fuel line at one end and a rubber vacuum tube at the other. This tube is attached to the plenum. This thing works is to keep fuel pressure at X psi above manifold pressure, whether this at any moment be at or below atmspheric (or in your case with turbo, above).

Inside this valve is a diaphram, if this diaphram leaks then pressurised fuel from the rail can leak into the plenum through the vacuum tube. The obvious result will be running rich, which may be worse at certain rpm than at other rpm.

I suppose it also could be that if this valve isn't working (but not leaking as described), that the fuel pressure might be too high, which could also cause rich running...?

Diagnosis? It might not be a good thing to block the vacuum tube, you might try it but I don't know what this will do (probably cause a too high pressure?). Try pulling the vacuum tube off and sniffing it for a petrol smell (it shouldn't smell of fuel), or maybe some fuel may even leak out?

[FastFwd]

sounds like fuel issue possibly, on my civic (NA b18c engine) when i got it back from the repair shop they put the timing out by one tooth on the crank and it idled fine and sometimes drove fine, other times it would shoot 1 meter flames out the exhaust and rev like a pig and have NO power, just make shure it hasnt skiped a tooth on the belt (use timing light) other than that make sure you pluged everything back in (from experience lol) if all else fails it may be ecu related, did you change anything on the ecu? thats the only thing to think about

Hey that is very similar to what my car is doing...and yeh it did shoot a one meter flame out the rear. the car feels all normal if you tred lightly on the accelerator but if u push to hard it feels like it will almost die because the skips are soo huge. but then even if u tred lightly you can sorta get passed the skipping stage which usually is at around 4000rpm. but it can be at ANY RPM its just usually around there. but even still it just feels like the turbo is there pushing pressure into the motor (more air) but something isnt doing what its supposed to, to compensate for this extra pressure. But how would it skip a tooth on the timing belt? ive never heard of a car doing that.

[aaronng]

Did you get your timing belt replaced recently? Did any workshop have to remove the timing belt to access other parts?

[FastFwd]

Had a thought, try this; attached to the fuel rail there is a return valve that allows excess fuel pressure to bleed off back to the tank. It has a low pressure return fuel line at one end and a rubber vacuum tube at the other. This tube is attached to the plenum. This thing works is to keep fuel pressure at X psi above manifold pressure, whether this at any moment be at or below atmspheric (or in your case with turbo, above).

Inside this valve is a diaphram, if this diaphram leaks then pressurised fuel from the rail can leak into the plenum through the vacuum tube. The obvious result will be running rich, which may be worse at certain rpm than at other rpm.

I suppose it also could be that if this valve isn't working (but not leaking as described), that the fuel pressure might be too high, which could also cause rich running...?

Diagnosis? It might not be a good thing to block the vacuum tube, you might try it but I don't know what this will do (probably cause a too high pressure?). Try pulling the vacuum tube off and sniffing it for a petrol smell (it shouldn't smell of fuel), or maybe some fuel may even leak out?

I give that a go tonight. also wanna check sparks. maybe give them a clean, i dont think thats the problem but it just feels really weird. It actually feels like all the SPARKS just turn off if u push the Accelerator to hard....Its hard to explain ill take a movie tonight...But yeh i think the best bet is Vac lines. Maybe even something with my fuel pressure reg. One thing i have noticed is ever since i took of the fuel feed to the left side of the fuel rail (standing looking towards the motor) is hasnt been right since then. I had to take that off to get it out of the way to remove the throttlebody. cheers

[B18cEG]

not sure how it skiped a tooth if it has but its not impossible, if you can see ur cams make the pointers point to up and look at the crank pulley and there should be a few line and a centre line on it, the centre line should line up with some plastic markers on the timing belt housing when the cams mark is up.

[FastFwd]

Well ill get that checked out. spoke to my uncle bout that and he doesnt seem to think its timing.

Brought it to him today and he said it could be 3 main things he could think of...

* ECU
* Map Sensor
* Dizzy
* Plugs (but thats a maybe)

I swapped ECU with my old stock one and went for a drive...same problem so its not ECU. pulled out the plugs, they only 4000k's old but i gave them a clean and chucked em back in. Map sensor i pulled out and checked but i dunno might need replacing. an Dizzy god i wouldnt know how to check it. Dont you need to get the voltage specks of the car then check each section with a voltmeter or something.

Other than that my uncle doesnt seem to think it could bee something i did while trying to fix the Idle issue.

Also i did what JohnL told me. Crimped off the vac supply direct from the plenum to everything including fuel pressure reg...still same issue... I think timing will be good to check. If you guys could give me few other things to check...Like an elimination process. That would be great.

[FastFwd]

Did you get your timing belt replaced recently? Did any workshop have to remove the timing belt to access other parts?

I generally dont let workshops work on my car unless its something that ive tried doing and i cant.

Sorry been burned in the past. Blown motors, cracked radiators, scratch interior and so on plus no refunds. Seems every time i get someone to look at it, they F$%kd something else in the process.

But yeh nah i havent change the belt since the rebuild 9-10thou ago

[aaronng]

So that rules out the timing belt unless it was very loose and the belt tensioner was already maxed out. But check it anyway.

[FastFwd]

So that rules out the timing belt unless it was very loose and the belt tensioner was already maxed out. But check it anyway.

Ill check it to be sure anyways but i dont think it was that as the car has been running perfect for weeks until i fixed the idle issue.