zx2gotboost

I told you guys that I juts bought a 1994 Honda Civic sOHC 1.5L non vtec car.

And I am trying to tune it up due to the last owner NOT taking care of it at all. Anyway, I replaced, Plugs, Rotor Cap, Distibutar, Fuel filter, Put an Short Intake on it, PCV valve.
I was having problems with Idle going up and down up and down. So my buddy (he has a 95 Civic w/ b18A1) Told me to take the ( he said its the IAC but i dont think it is the IAC, ???) peice off the TB, it has a coolant hose running ito it. take that off and tighten a plate down behind that. What sensor is that called?????????
Anyway, we tightened it down, and i dropped it breaking the nipple for the coolant hose off it, so we by passed it and hooked the hose up to the other small hose.

Well, now the idle is fixed, although, after I drive the car for a few miles, the car starts to missfire. Its like it ONLY missfires when it warms up. Could that sensor being bypassed cause that? The distributar is not advanced of retarded. And I swapped wires and it still missfired.

zx2gotboost

Well the sensor now has coolant going though it, i fixed it... Although, the damn car still missfires when it gets warmed up. I checked for codes, no codes showed up. HELP!!!!!!!!!!!! Im going crazy whats the problem???? Could a broken Water pump cause this???

tpr

When you say misfire. Is it at all speeds or just idle or part throttle? The map sensor can make the car appear to be misfiring if it is not getting the proper vacuum signal. Your map senor is on the throttle body. Take it off and clean the port in the throttle body and the rigid tube to the map sensor itself. Be sure the gasket is good. Good luck!

CsiRUN

are you getting a cel and what for?

dpkelly

Did you clean the screen on the IAC valve before putting back on the TB? The IAC valve is activated when the car is warm and helps the engine cope with loads on it during idle, like A/C or lights.

Cheap Bastard

what about the plug wires? that's the first thing you should replace.

civic_driver

he was fixing the FITV... you gotta provide more info about the "misfire" condition so we can help... what did you do before the misfire started?

zx2gotboost

Good point TPR.... missfires at idle and part throttle. NO cel whatso ever! And that paice I thought WAS IAC was not, i am not sure was sensor it is, but it is on the TB below it, it has 2 small coolant lines going into it..... The car had the missfire since I bought it.

Anyway, We ARE getting somewhere now, Someone mentioned that the IAC is only actiavted when the car warms up, so mabey I need a new one? Or it needs cleaned? or the gasket? Knowlage me please.

I started the car up tonight, no problems whatsiever, so missfire nothing. The wires DO need to be changed, although, we had an extra set of wires our shop that were used, but we put them on and the car still did it. So I say its NOT anything to do with Ignition system........

One person explained to me that the head gasket may be slightly blown and water is leaking into the cylinder causing the plug not to fire........... I say NO! Car does NOT over heat, no smoke out the exhaust.

Im sure if something was messed up witht he ignition system, CEL would pop on... Correct?
As I said before, the car was abused an not taken care of it. So now im going to look into the MAP sensor...........

zx2gotboost

I dont understand, Why havnt I gotten a CEL............. So im thinking its the MAP sensor or Could it be a leakage in air? Maby the intake manny gasket is leaking? hmm.. not Cuz the MAP would read that and CEL right? Im FREAKN' Lost........... I drove the car otday after work, after about 10 min of driving it started acting up again, Idle when REALLY low, But it seemed to drive decent.. not great.....

zerogravitycrx

just get a motor swap, by the time fixing and putting your money fixing and fixing you probably have bought'n your self a new used motor! lol, (from your buddy carbon man or nickbluezx2)

CsiRUN

I am having a similar problem with my car... have you driven the car with this problem? Does it bawg done real bad while driving when you let off the gas then jolt when you press down on the gas?? Me and my buddy are working on mine right now and i got a cel saying it is my IACV but my IACV isnt broken so we think it is a vacuum leak

zx2gotboost

I have been driving the car daily, I juts got my new APC 9.3mm wires in put them on, and it still does it.............. I am going to replace the IAC V and possibly the distributar one more time, if nothign works, in goes the D serise Japan Motor my buddy is selling for 300 bux!

CsiRUN

Dont replace your IACV that thing is like 150 bucks(well mine was) i am getting mine figured out pretty soon (i have similar prob) it has to be a vacuum leak or something.

95DxSi-R2

u might have a coil breaking down

95DxSi-R2

did u check fuel psi?

zx2gotboost

im thinking the used Distributar I put on is bad as well...............

Well.. tonight I was messing with the car, I have been driving it all day "missing" So while the car was at idle, I pulled the connector on the fuel injector ( the closes to the driver side, Whats that cylinder #4>??) And the Idle stayed the same, Unplugged the second one from that one and the engine died...........

After going inside to finish up supper, Letting the motor cool, I then go out side and pull the same injesctor plug ( closes to driver side) and the idle dramatically dropped........)

After both tries I got a CEL for number 16 (fuel system) But of couse its gonna come on, I pulled the connector to the injector.........

So I am so very confused....................
injectors? Distributar?
Well, I have a spare motor sitting in my shop, so I swapped out IACV ( I polished it, cleaned the sreen on it, and cleaned out all the corrosion from where the coolant goes as well!) Car still ran like ****.........

I doubt its the injectors, I put a whole new fuel rail with injectors on my car from another car, that I cleaned and polished.......
Its NOT : Wires,Rotor,cap, PVC valve, IAC,

Mabye its the MAP sensor?
Like I said, it ONLY acts up when the car gets hot or warms up.............................. I am getting NO CEL eather................ HELP!!! ARRGGGGG

mikey-ej7

**** man, hope this never happens to me.

I just started getting a "grinding" noise when I warm up. Hopefully the full tune up I'm about to do will help

zx2gotboost

Ok as of today September 9nth 2005 5am I replaced the following:

Plugs(ngk)
Wires (APC got them cheap dont ask :-/ )
Cap
Rotor
Put a brand new coil in dustributor
I have distributor advanced a little

Started the car up, it seems ok for a little, then ofter i turn it off, then turn it back on, its soundling like "missfire"
But drives ok

I dont wanna blame it on Injectors/ fuel rail because I swapped out the rail injectors from another d15b7 Motor

Mabey its the MAP sensor?
What else in the fuel system could it be?

Im really lost......

Could it possibly be a warped head, since the head gasket was blown 2 times within a 4 year period?

zx2gotboost

So today, driving to work, I get about 2 blocks from my work, im sitting at a stop light and the "missfire" happens really bad, drops low RPMS,(after driving the car hard of course) then as I turn up my system, it seems to drop even lower, like something to do with the alternator or battery? This is weird..................

zx2gotboost

ok so tonight, driving home from work, I drive for about 20 minuts or so, then I hear the cooling fan kick on and the RPMS REALLY go low, IM like "WTF?" Then I check the coolant gauge, its a little above where it usually sits, Obviously its overheating. So I check the radiator, DAMN, that bitch was HOT, it was BONE dry! I fill it with water, the water is boiling out, then it cools off after a little while..............
Thing is, I NEVER see any water leak from my car. And the temp gauge always sits right in the middle.

So this leads me to new boundries..... I think it may be the water pump? There is NO smoke coming out exhaust so it couldnt be head gasket. Or could it? Where is the water going if its leaking? This MAY be the "missfire" (so to speak) problem. Mabey the internal engine is getting too hot due to bad water pump? Or a blockage possible at the water pump from broken propellers, causing the RPMS to drop and it feeling like "missfire"

HELP!

zx2gotboost

This thread should be a "Dear Diary" Cuz it seems like Im writing to myself here........ LOL

Anyway, I think Im preety sure its the head gasket now.....
Or Warped head, I pulled the #4 plug that I told you was "missing" and smoke came out of that cylinder. Whats happening is, the gasket or head is allowing some coolant into the cylinder, blowing out the spark on the plug, causing it to missfire.

So, Imma search for another head and get a new gasket, and possibly checkt he water pump as well. I may think about doing the "MINI ME" vtec head swap..... what are your opionions on that? Ill search on how exactly to do it.

Anyway, Ill be swapping the head out, if its the stock or not, so I may not be on here for a few days.

Thanks for everyones help!

dpkelly

Interesting problem. Mine's almost the same except mine overheats with high speed driving (between 120-130km/h) and the oil slowly disappears instead of the coolant. I'm thinking the hot engine is cooking the oil due to a faulty waterpump or a head gasket that is partially blown (or about to blow). Good luck.

flood

Sounds like your hosed.

Compression test will only confirm the issue and tell you how bad it is.

zx2gotboost

well, today I drove to the store, and it was missfireing like crasy, getting worse, So i pulled the # 4 plug, Yep... Coolant all over the plug... Time to pull the head.....


So I pulled the head tonght, and sure enough, between #3 and #4 cylinder on the head was warped, So I slapped another head on it, im not completely done, I need to get a new intake manny gasket, and hook up some sensors and hoses, and ill let you all know how she runs!

Ps, Im starting to love Hondas more and more, the head swap was fairly easy compared to my ZX2 . !

dpkelly

Lucky for you, you had a head nearby (other than your own ).