Ok, I have a '90 LS Auto and I have been having some weird issues. The car does some weird hesitation/stuttering crap. I can be at a dead stop, put my foot on the gas lightly, and the car goes then feels like it is bogging down then goes then bogs then I put it to the floor and it takes off like it should. It does this when I hit turns and try to accelerate too. I can be going into a turn and hit the gas and it feels like it is going to drop on its face. Can also do it when going up a hill...Ill put my foot on the gas to keep a constant speed and the rpm's surge about 300-500 rpms every couple seconds. And one last thing, I went around a corner hit the gas, it bogged then back fired...WTF!?!?!?!?!

Now what has been done. I have changed the plugs, wires, cap, rotor, fuel filter, fuel pressure regulator, injectors are good, and intake filter is good. I was told it couple be a sensor or an anti-freeze issue???????

PLEASE SOME HELP!!! I have dropped so much money into this thing playing the guessing game.

 

Are you throwing any CEL's?

 

No lights at all


Come on guys....I know there are people on here that can help me...anyone?

 

Update: HERE IS A VID

This is taken in nuetral with my foot steady on the gas....you can clearly see the rpm surge.....what is the issue?

http://s82.photobucket.com/alb...5.flv

 

how's your rotor and cap? what about your 02. throttle sensor?

 

The cap and rotor are new and I haven't meesed with the 02.

 

try a full tune-up and some injection cleaner. When you backfire, it cause the sparkplug, blows out. ex. too much fuel, distributer/spark probelms etc.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mfoehrkolb &raquo;</TD></TR><TR><TD CLASS="quote">try a full tune-up and some injection cleaner. When you backfire, it cause the sparkplug, blows out. ex. too much fuel, distributer/spark probelms etc.</TD></TR></TABLE>

Well have have done all that....I have replaced everything tune up wise and have tried injector cleaner.....im at a dead end and I dont know what else to try

 

maybe a MAP sensor.

 

maybe it's a tps sensor? or maybe you have timing issues?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc2415 &raquo;</TD></TR><TR><TD CLASS="quote">maybe it's a tps sensor? or maybe you have timing issues?</TD></TR></TABLE>

I have checked and rechecked the timing, so that is good. Is there any test to do to see if it is a sensor instead of buying new ones?

 

How do I see if the sensors are bad?

 

i think if your sensors are shot to ****, then it will throw a cel. however, if it's not and it's just dirty but not totally gone it will cause your car to run funny. i think team-integra has a link to how to clean certain sensors might want to check that out

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc2415 &raquo;</TD></TR><TR><TD CLASS="quote">i think if your sensors are shot to ****, then it will throw a cel. however, if it's not and it's just dirty but not totally gone it will cause your car to run funny. i think team-integra has a link to how to clean certain sensors might want to check that out</TD></TR></TABLE>

I posted the same thread over there but I haven't gotten any responses yet

 

to check your sensors you'll need amulti meter. to check map sensor there are three wires
yel/red
grn/wht
red/grn
with key on engine off you should have 5 volt reference between yel/red wire and grn/wht
between red/grn and grn/wht you should have something like 2.5 2.8volts

with engine running or with vacuum pump attached apply vacuum and check voltage again between red/grn and grn/wht as vacuum increases voltage decreases. i really don't think this is your problem b/c you usually throw a cel.

same setup with tps sensor but i don't know the wire colors for that. hope this helps

 

Either your MAP or TPS sensor are shot or you've got an air leak behind the throttle body... ie. the manifold gasket.

Do the RPMs loop at idle?

I had my '92 LS drive really bad one afternoon. Luckily I had a Apexi VAFC hooked up and switched to the voltages screen, to find my TPS going all over the place in voltage.
Replaced it and it has run great since...well, before I blew the engine up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by XSIintegra &raquo;</TD></TR><TR><TD CLASS="quote">Either your MAP or TPS sensor are shot or you've got an air leak behind the throttle body... ie. the manifold gasket.

Do the RPMs loop at idle?

I had my '92 LS drive really bad one afternoon. Luckily I had a Apexi VAFC hooked up and switched to the voltages screen, to find my TPS going all over the place in voltage.
Replaced it and it has run great since...well, before I blew the engine up </TD></TR></TABLE>

No loop at idle. I had that but I cleaned the IACV and it went back to normal.

 

Still no fix............

 

TPS or MAP sound like a good place to start. Did you replace/mess with anything right before it happened (this includes ANYTHING, even if you dont think it caused the problem). It does sounds like its getting too much fuel which would be the MAP or TPS. It could also be an ecu issue, however thats unlikely unless you just installed an afc or chip. Is the vacuum line going to the MAP broken? Try replacing that as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95 integra &raquo;</TD></TR><TR><TD CLASS="quote">TPS or MAP sound like a good place to start. Did you replace/mess with anything right before it happened (this includes ANYTHING, even if you dont think it caused the problem). It does sounds like its getting too much fuel which would be the MAP or TPS. It could also be an ecu issue, however thats unlikely unless you just installed an afc or chip. Is the vacuum line going to the MAP broken? Try replacing that as well.</TD></TR></TABLE>

I had two things that I messed with prior to it happening.

1.) I had a small leak in a hose leading to my IACV and I replaced that hose with one that was to long so it was kinked. I put the right length in and no more idle searching.
2.) I had an injector leak which was bad enough to smell inside the car at all time and I replaced that.

After I did those two things I noticed the surging issue which is slowly getting worse.

Oh yeah, and the exhaust is messed up but I was told that that isnt an issue. I accidentally hill jumped the car...lol...and the pipe broke the welds coming out of the muffler to where the exhuast tips were dragging. When the welds broke it actually broke the pipe free inside the actual muffler so it would swing up and down freely but unable to fall off....a little coat hanger action fixed that. All of that was prior to the anti freeze leak fix and the injector fix.

 

This crap keeps gettin worse

 

hey did you end up figuring out what was wrong with your 90ls?