dueceman

1996 accord vtec..
ive looked through the messages on here and as a result i have cleaned the egr ports and IACV (occasional rough idle at stop)

but to be honest neither really made any effect on the performance.. havent cleaned the throttle body yet..

anyone else have this issue..regular driving accelerating from just above 2,000 rpm in 2nd gear is where i feel the stuttering or hesitation the most until revs get to 3,000 or so then accelerates smoothly..

dxtosirex

check your timing, pull your spark plugs and check. also pull off your Dist cap and rotor, check for cleaning. plug wires might be old.

accord99power

your timing isnt off unless the belt jumped, I would check all that was said below but i would also buy a can of bg intake system cleaner and bg fuel system cleaner, and clean the throttle body and the iac, they have instrucitons on the can, also do u have a fuel filter? replace pcv valve as well this is a great cheap tuneup oportunity and even if it doesnt work at least your enigne will love u now!

dueceman

ok well i am handy but no mechanic..so i will pull the plugs and have to compare them to one of my bentley manuals etc..

what is IAC ?

i guess what im asking is what is causing these symptoms..ie what causes a car to hesitate at lower rpm under load...is it too much fuel? not enough spark? oxygen sensor misreading something?

anyone give me any reasons why the hesitation occurs?

dxtosirex

also check your air filter. it might be dirty.

dueceman

ok perfect example..so why would a dirty air filter cause hesistantion at lower rpm and not at higher?

Bozok

IAC is Idle Air Control... I think you already know what that is, since you said you cleaned the IACV (Idle Air Control Valve).

At lower RPMs, there is not as much air moving through the air filter. So, if it is partially clogged, there may be a major lack of air getting to the engine. However, at higher RPMs, since the air is moving faster through the air filter, it may overcome the partial clogged-ness of the filter. That's my rationale on that one.

PCV valve: The PCV valve is pretty much closed at low RPMs. At higher RPMs, it opens up more. If your PCV valve is stuck open, then more air than normal is getting to your car at lower RPMs, reducing power. At higher RPMs, the PCV valve is open like it normally would be at higher RPMs, thus giving the correct amount of air to the engine, producing the right amount of power.

An EGR system problem acts much like a PCV valve problem. It is closed at low RPM, but opens at higher RPMs. If it is stuck open... same deal as with the PCV valve.

As far as why the other suggestions may produce the hesitation that you talk about, I don't know.

dueceman

thanks for the info bozok.thats exactly what i was looking for..no sense just replacing parts just because they are easily replaceable hoping to find one that solves it..id like to try and narrow things down first

DrZFiNeSt

iTrader: (1)

Just do a basic tune up and also is it throwing any codes?

accord99power

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dueceman &raquo;</TD></TR><TR><TD CLASS="quote">no sense just replacing parts just because they are easily replaceable hoping to find one that solves it..id like to try and narrow things down first</TD></TR></TABLE>

You should be replacing the things that i stated if you havent already, rejecting to tuneup your engine only leads to more problems ie carbon buildups, etc.

dxtosirex

its not the car its the driver lmfao.