i did do a search but could find anyone with the same problem. any how..what would cause this? it is throwing an oxygen sensor code but i dont have a o2 to toss in to check if its the prob yet. this is in a freinds car. when you crank it up it idles kinda rough for a sec then smooths out and idles fine..a little high..but nice smooth idle. then if you go drive it, it drives fine untill 3500 rpms and starts hitting rev limiter. is this a safe mode in the ecu or something???? it is obd-0 and i know jack about this stuff. just trying to help a freind out to get him on the road again. any help would be appreciated. thanks guys

 

have you tryed to replace the oil ? My friends Hx civic did a rev limit aswell once... after an oil change it went back to normal.

just an idea....

 

I am not too familiar with that kind of problem. However I would personally recemmend a compression and leak down test.

Tell your friend its time for both of these.

 

What about fuel. Is it getting enough fuel? Or is there spark?

 

have you tried reseting the ecu? im thinking ingnitor...but then again i could be way off...

 

Sounds like the ecu... is it a stock ecu or has it been tuned or messed with?

 

Sounds like your ecu is running s in "safe/limp" mode. It gives you just enough to get home. You need to figure out what's throwing it. Go through the troubleshoot flowchart in the Helms manual (hopefully you got one).

 

its getting fuel and spark and runs fine untill 3500 rpms, ecu is stock, and its throwing 3 codes now...o2 sensor, some kinda pressure sensor and something else..he was not sure when i talked to him today. i went through a trouble shooting thing in the haynes manual that he has but that thing sucks. perhaps saturday i can get it figured out. i just wanted to see what you guys in put would be. what about timing? if the timing is a bit off will it dfo this? like a tooth or 2 off

 

Check G2ic.com. There is a sticky about the codes and what-not.

 

dude dude try this

Check the Speedo cable, trust me my car did the same thing i had a b16 swapped in w/ a chipped ecu 2 step launch system set at 4.5 i couldnt go passed 4.5k in every gear, cause my speedo cable was broken..

without the speedo working, the ecu told the car i was at zero mph which means my 2 step launch was activated not letting me go passed 4.5k LOL

Mother ****** that p28 pissed me off, damn speedo cable stumped me for months until B series in San marcos fixed it!

 

your car is in limp mode...gotta fix those ECU codes before it will run properly.

 

check your dizzy's ignitor ad coil. btw i dont belive the ls's had limp mode.

 

^is that true?

obd0 LS' have no limp mode?

TTT

 

I'm not too hip on the whole OBD0 thing, but off subject a little, I've never driven a car where limp mode would lower the rev limiter, typically all it does is pull timing, decreasing fuel mileage and horsepower.

Either way, sounds like an ingition problem to me, what's probably happening is your blowing out spark for some reason, first thing to check would be your sparkplugs, make sure they're still in good condition and gapped within spec, if not, regap or replace them, test your ignition wires to make sure they're within spec because one or two of them could be bad causing weak spark and its blowing out at that higher RPM. Just go down the line with your basics, rotor, cap and all that stuff and hopefully you will get to it before you have to start looking at the ignitor or any other big ticket items.

If you do get to those big ticket items, what I normally do is just hit up an autostore and order them one by one at different stores. First I would start with the ignitor, if thats not the problem, return it and simply say "I didn't need it," and not that you put it on your car or anything or you were testing to make sure thats what was wrong. Sometimes they wont take it back, but we both know that ignitor will work damn well for the next person who needs it. Make sure you're not ordering a special order part or you wont be able to return it.

Good luck.

 

ive driven odb1 where it lowers the rev limiter..obd0 could be different, but i dont know in that case.

 

Rather than go through the car one part at a time you can also test the components with a multi-meter. It's a good tool to learn to use when diagnosing the problem. You can get a decent digital one from the Rat Shack for not much money.

I had an ignition problem with my 92. The cause was a bad plug wire, unfortunately I pulled it off while running the car and fried the ignitor or coil to check which cylinder. I found it was cheaper to buy a whole new (all new components) distributer from Distributer King than the individual parts. It was a total bolt on cap & all. I highly recommend them - great price and turn around.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSracing94 &raquo;</TD></TR><TR><TD CLASS="quote">ive driven odb1 where it lowers the rev limiter..obd0 could be different, but i dont know in that case.</TD></TR></TABLE>

and which car was this? ive had egr code throwing, O2 sensor codes, speedo codes...etc and my cars redline has not droped and its a obd1 91 rs

 

No, they have it, trust me, I fried my obd-0 ecu, and it went into limp mode. wouldn't let me revv past 3500. It has limp mode. I had to replace the ECU to get it to work again.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by projectTeG &raquo;</TD></TR><TR><TD CLASS="quote">

and which car was this? ive had egr code throwing, O2 sensor codes, speedo codes...etc and my cars redline has not droped and its a obd1 91 rs</TD></TR></TABLE>

it was my 97 hatch with a b16 with an OBD 1 conversion harness and it went into limp mode for the MAP and o2 sensors

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSracing94 &raquo;</TD></TR><TR><TD CLASS="quote">

it was my 97 hatch with a b16 with an OBD 1 conversion harness and it went into limp mode for the MAP and o2 sensors</TD></TR></TABLE>

right thats a vtec system their ecu works alil different from the ls's i never said the vtec engine never had a limp mode

 

well, i have a multimeter and i know how to use it..afterall i am an aircraft electrician...i have a spare ignitor that i will give my freind to get his car going. im going over there tomorrow to check it out. the o2 has been replaced by the guy that owns the car and its still doing it. i guess i will start chasing down ignition **** untill i find the prob. is there any way of resetting the ecu??? dont you just unplug the battery and the ecu for a while? anyhow, i will keep you guys updated on how it goes. thanks for the help

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by japan4racing &raquo;</TD></TR><TR><TD CLASS="quote">well, i have a multimeter and i know how to use it..afterall i am an aircraft electrician...i have a spare ignitor that i will give my freind to get his car going. im going over there tomorrow to check it out. the o2 has been replaced by the guy that owns the car and its still doing it. i guess i will start chasing down ignition **** untill i find the prob. is there any way of resetting the ecu??? dont you just unplug the battery and the ecu for a while? anyhow, i will keep you guys updated on how it goes. thanks for the help</TD></TR></TABLE>

unplug the ecu fuse or disconnect the battery for a couple of seconds