Hi People, i just finish my motor swap, its a obd2 gsr with only 60k miles on it.
Its going into a 93 civic cx. My problem is that when its on vtec, the car feels likes its sputters an doesnt want to go forward. The motor is bone stock, i dont know whats wronge with it.

No CEL
Stock p72 obd1 ecu
Vtec wired Corrrectly
Timeing is correct
Yea i have enough oil
No vacumm leaks
New Plugs an wire
Distributor is in workin order
WTF I hate vtec
New Fuel filter
New fuel pump
Clean all the grounds
Put a used stock regulator
New tps sensor
Can a bad tps be the problem? When i hold the gas like 10%, vtec engages fine.But when i full throttle it just **** face, doesnt want to go anywhere it feels like its bouncin off the rev limiter. Sorry for the typo error its like 6:04 an i cant sleep because of this car


Modified by phyz at 1:48 AM 12/10/2006

 

make sure the tps and map sensor plugs aren't backwards.

 

but if they were wouldnt the exhaust smell funnyan idle funny? car idles fine runs fine but when its in vtec it back fires,studder

 

his mil would be on if the tps and map were backwards though. hmm

 

you might also wanna pull the rotor off and make sure the distributor shaft isn't rusted where the rotor slides onto it. I've seen that cause problems identical to yours on a friend of mines b16.

 

oil pressure?

 

there is plenty of oil, there is oil pressure. Ill check the rotor since the person said the motor was sitting in his backyard for a year. I guess rain or something might of got inside of the dist.

 

hmm just found out that my brother didnt put the new plugs i bought. Maybe that could be the problem?

 

OK found out that the ckp was still connected to the harness would that cause vtec not to work propertly

 

an OBD2 motor and an OBD1 ECU might be the issue.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blkacgsr &raquo;</TD></TR><TR><TD CLASS="quote">an OBD2 motor and an OBD1 ECU might be the issue.</TD></TR></TABLE>
That's what I was thinking.

 

also i put a new o2 sensor in. Ima take a quick shower an go to a local meet up, see if my car is working

 

guess its not working! Has anybody that tried everything but couldnt get there vtec to work properly. But then it was a simple problem that no one could think of? Please tell me what yha did. This is killing me, im about to bite the apple an bring it to the dealer $$$$$

 

If i ever figure this problem im going to disney world with my bubble back

 

some on help. need an idea

 

check timing belt..
,make sure is on tdc and everything lines up correctly
how does it idle?

 

it idles fine

 

Found out my compression was 240 210 215 240 since vtec engage it started to sputter. I think i might of bent a valve. Also vtec was unplugged an tryed to gun it it sputter, studder pops sounds like its bouncing of the rev limitor damn its crazy. The car it self idles fine, untill it reaches 5g an above.


Modified by phyz at 3:14 AM 12/5/2006

 

Ow can a bent valve makes the car sputter on high rpm or just low?

 

yes , its possible , its also possible if they have recently been adjusted that your valves are tight , mainly exhaust. running an OBD2 engine is no prolem with OBD1 harness.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by phyz &raquo;</TD></TR><TR><TD CLASS="quote">OK found out that the ckp was still connected to the harness would that cause vtec not to work propertly</TD></TR></TABLE>

the CKP cant be unplugged from the harness cause the CKP is in the dizzy. on OBD2 engines , they added a new sensor , the CKF , crank fluctuation sensor. located on crank pully end of engine on the oil pump. and your OBD1 harness wont have a plug for this. and its not needed for the OBD1 ecu as it wont be looking for it. what dizzy are you running on the car? and what year is the engine , you say OBD2 but theres 2 different OBD2's.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SpoonSirG &raquo;</TD></TR><TR><TD CLASS="quote">his mil would be on if the tps and map were backwards though. hmm</TD></TR></TABLE>


No, the ecu can not tell if they are backwards. Both output a 0-5V signal.

However, if they were backwards the car would idle weird and would stutter whenever the throttle is pressed.

 

Change the fuel filter. Sounds like it's starving out at high rpm.

NVM just read your post more carefully. It does sound like you are missing some fuel in the top end though.

 

From what I've been exposed to in my time with the honda/Acura scene, I've come to the conclusion that VTEC = problems. Yeah, of course there's those people who are going to say "my car runs fine, and I swapped the motor myself". But for the most part there are just too many things that can, have , and will go wrong. I'm going to start a thread on this see what people think.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DA9 Purist &raquo;</TD></TR><TR><TD CLASS="quote">From what I've been exposed to in my time with the honda/Acura scene, I've come to the conclusion that VTEC = problems. Yeah, of course there's those people who are going to say "my car runs fine, and I swapped the motor myself". But for the most part there are just too many things that can, have , and will go wrong. I'm going to start a thread on this see what people think.</TD></TR></TABLE>

Youre an idiot. Get your noob *** outta here with comments like that. Swapping out an engine isnt rocket science. The OP just may have forgot to connect something correctly and/or could be a problem with the motor originally. VTEC=Problems is a dumb *** statement. DA9 Purist posting useless comments=problems. Know your **** before you post ***...

 

Sorry I got all heated and didnt reply to the OP, def check your rotor shaft on the dizzy. mine was rusty and was causing sputtering as well. sometimes even going into VTEC it would sputter, but once in it would be fine. I take it you replaced your plugs but if not either replace them or see if they are properly gapped. check your spark plug wires. if all ends up to be fine, take it in for a valve adjustment. hope this helps...

ohh and i had the same problem, heres what happend to me, sounds familiar:

https://honda-tech.com/zerothread?id=618974

i took my car into acura and made them check my Vtec solenoid, they cleaned it out and found that it was gunked up/clogged preventing VTEC to engage properly. so thats anotehr thing to check...