dueceman

I had posted about a month or so ago about how my 96 accord vtec has a slight hesitation under acceleration and received replies about replacing this and that etc..

now that its cold up here in canada i noticed that when the car is cold the hesitation is gone..but once its warmed up and the temp is up the hesitation comes back..

does this give you guys any better idea of what it might be?

like is the egr valve only active when the car is warm? or oxygen sensor?

thanks

Mike

dueceman

hmm no answers???

Tyte-S

When I had a bad secondary oxygen sensor, I was getting a slight hesitation when I shifted gears and hit the throttle, it would pause for a brief second, then give me power. Are you throwing any codes?

Tyte-S

Low oil pressure and the car still running in open loop (cold, with the oxygen sensor not warmed up) can both affect whether VTEC will work or not. I was under the impression that it was hesitating after he shifted and went to apply the throttle. In th article you posted it seems as though they are referring to hesitation when the VTEC is going to engage, or maybe I interpreted that wrong. With mine, the secondary O2 was bad, and not making the correct reads, and in the same way as you posted, the ECU was calling for fuel cut off to protect the engine. for the nice post though. Been doing it 22 yrs, you must know your ****.

dueceman

i dont need to be just after a shift..all i need is to be at lower rpm levels and apply throttle and the car seems to almost bog down or hesitate then it eventually gets the power.. whereas today with the temperature at about 4 celcius.. 40 or so for you americans..when the car had just been started and still warming up throttle response and acceleration was instant and smooth..

Tyte-S

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyte-S &raquo;</TD></TR><TR><TD CLASS="quote"> Are you throwing any codes?</TD></TR></TABLE>

dueceman

sorry i didnt reply to the codes question..i havent taken the car in and dont have anything to check for fault codes with..

dueceman

so no one thinks this sounds like an egr valve? car is fine when the valve is closed..then hesistates and occasionaly has a rough idle?

Chiovnidca

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dueceman &raquo;</TD></TR><TR><TD CLASS="quote">I had posted about a month or so ago about how my 96 accord vtec has a slight hesitation under acceleration and received replies about replacing this and that etc..

</TD></TR></TABLE>
Disconnect the vacuum line from the egr valve and go for a test drive. Does it still hesitate?

sarkaztik

I have the same problem with my 94, when i first start it up it has good acceleration and you can feel the v-tech kicking in but when i drive it for a while and it gets warmed up it seems like you cant feel the vtech it just has very little pickup after 4000rpm. some body told me it could could have some thing to do with my 02sensor and my exhaust set up they said the 02 sensor is not reading right because there is no catalytic converter so it probably has no back pressure . that would make a little bit of sense.

accord99power

i had a loose o2 sensor wire and it fixed my problem and sound slike your same syptoms everyone else was like its distributor and this and that too, the best fix is research and do yourself! i cant imagine going to a dealership with a hesitation problem, haha.

dueceman

well i tried removing the vacuum hose to the egr valve and nothing changed..and the hesitation is intermittent so i may move on to the o2 sensor next..

GhostAccord

Just a note on your codes, Has your check engine light been on? If it has then you can use the service check connector and a paper clip to get the basic codes from your car. If your CEL hasn't come on than don't worry about looking for any codes.

https://honda-tech.com/zerothread?id=2128762

dueceman

nope no service or check engine light at all

Chiovnidca

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dueceman &raquo;</TD></TR><TR><TD CLASS="quote">well i tried removing the vacuum hose to the egr valve and nothing changed..</TD></TR></TABLE>
Good, that rules out a problem with the egr system. The next thing i'd look into would be leaks in the secondary portion of the ignition system. (plugs, wires, cap, rotor, coil)

dtapia

does is seem like a stumble when you accl and then go away ?

dueceman

it is most noticeable in 2nd gear..in the lower rpms when you accelerate..the car seems to hesitate..

GhostAccord

I would forget about the EGR and O2. Time to start looking at your Fuel injectors. Then your MAP sensor

This may help you out. It's helped me on many occasions.

http://spoonhonda.com/downloads.htm

I downloaded the manual named Accord 1994 CD7 CD9 USDM JDM Service Manual

I think the trouble shooting guide your looking for is on page 203 of this PDF file.

I love this PDF it's link active so no need to search for pages. Point click and there you go!

Cheers and happy reading. Hope this helps.

dtapia

sounds like pluged egr ports

Chiovnidca

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dtapia &raquo;</TD></TR><TR><TD CLASS="quote">sounds like pluged egr ports </TD></TR></TABLE>
We already ruled that out. He says disconnecting the egr valve makes no change at all.

dtapia

man i have to stop staying up so late.

Chiovnidca

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dtapia &raquo;</TD></TR><TR><TD CLASS="quote">
man i have to stop staying up so late. </TD></TR></TABLE>
Or take a nap once in a while.

dtapia

lol not that old yet

dueceman

and i already cleaned the egr ports and that did nothing as well

yetars

My 1991 Accord was stumbling under low acceleration. I found my problem and I believe it's the same many of you are having. It turned out to be the ecu needed to be reset. It got messed up. My battery had gone dead while I was doing some body work over a one year period. Occasionally, I would jump start it so that I could move it around. That meant I was resetting the ECU Constantly. The problem is, if you reset the ECU after it is warm or reset the ECU in the middle of it's learning cycle, you set your sensor parameters incorrectly into the ECU's memory. In my case, My temperature sensor's parameters were off. While I was having the acceleration stumbling problem, I unplugged the TW sender, no more stumbling. I tested the sensor, it was within specs. Reset the ECU properly, the problem went away.

Good luck. I went through all that you guys have gone through. EGR, distributor, timing, torque converter, spark plug wires and plugs. None of them really explained the stumbling only under low acceleration, when warmed up. It was not intermittent, it was under very specific circumstatances. Bad parameters, explained why the check engine light did not come on. Bad parameters explained why, when I disconnected the sensor, the ECU went to warmed up default condition for that sensor, so the car ran fine when the sensor was disconnected.

Good luck and let me know what you find.