reed857

alright within the past month or so my car has just been f'in with me. sometimes it runs like a champ and others it runs like ***.

Most of the time its in the morning when it runs like ***. it will buc, idle so low it will cut off, have a roaming idle, break up over like 2000 rpm. and it just pisses me off cause other times it will run like a champ.

This is a list of things that I have done after searching for similar issues.

1.changed fuel filter
2.changed spark plugs and checked gap
3.ran seafoam and some lucas injector cleaner through. not at same time
4.changed oil. then changed it again after 500 miles (some guy said he did it and it helped) and oil filter of course
5. replaced battery (needed it)
6. replaced both positive and negitive battery terminals.
7. replaced negitive ground wire (have a earth grounding kit on the way just in case)
8. have been mased street tuned
9. check to make sure there are no vaccum or exhaust leaks.
*****10. sorry forgot that I cleaned the IACV.
the main thing that I keep going back to is my intake manifold which has a vaccum leak in it. it came from the factory like that. its a golden eagle im.

I am just almost out of ideas to what it could be. I have another im that I am going to order and get retuned with it. but in the mean time I would like to try to fix this problem.


Modified by reed857 at 9:32 AM 10/3/2006

1992Si

the main thing that I keep going back to is my intake manifold which has a vaccum leak in it. it came from the factory like that. its a golden eagle im.

Your telling us you have vacuum leak ? or do you think you do?

I would guess your problem is in the fast idle circut or IAC. I'm into 92-95' I believe your year is different.

I'm surprised you did so many things that would not fix the problem.

For all the $$$ you spent you could of had a mechanic look at it and fix it.

JDM_Ej

No CEL's huh?

You said it "breaks-up" at 2k rpm's sometimes... kinda like you hit a wall? You floor it but it doesnt go anywhere, then will suddently catch and you go again?

Check your MAP sensor. Replace it with a known good one and make sure the connector is secure. I had the same issues you had, and found out it was a MAP sensor slowly going bad.

If thats not it, I would check the outputs for all sensors if you can. Verify they are working correctly. A CEL won't come on if the sensors still work, even if the data they output is incorrect. A CEL only comes on for a sensor that doesn't work at all, or there is a break in the wires.

Vindicator9000

You're telling us that you KNOW you have a vaccum leak in the IM and you're not sure if it's causing your idle problems?

I would recommend fixing the intake manifold problem first, because if you have a vaccum leak anywhere, you're going to have idle problems. That said, it seems to me like problems caused by vaccum leak tend to be more of a regular, up and down idle than bogging, cutting off, and stuttering.

I recently had the same sort of problems as you're describing, and replacing the IACV fixed them. I picked one up for around $50 on ebay, and you can change it in about 10 minutes.

reed857

thanks for the quick replies. thats one more thing that I did to was clean the IACV. and I about the IM if I plug the vaccum leak then the car will shut off completely.

it breaks up like its missing really bad. but still goes if that makes sense. its above 2k rpm but doesnt happen all the time at 2 some times not til 4.

and then the hardest part to figure out is that it will run great sometimes.

it reminds me of one of my ex girlfriends. sometimes I love her and then others I want to get out and start kicking her.

and the cost has not been that much. I have dont all of the work (what work it was) myself.

no CELs. kind of wish... running an aem ems but I dont know how to tune.
looks like I am going to see about a map sensor. which I had one laying around.

JDM_Ej

Just ask a friend to borrow his map sensor for a few and take it for a ride... are you boosted?

reed857

yeah boosted. I think that I have a map sensor on on tb. does that sound right? its not pluged in though. the one that is pluged in is on my im.

jadugartir

And just why is your MAP sensor not plugged in? Your ecu isnt psychic, it needs a sensor to tell it how much air is coming in through the manifold, so that it can give a proper amount of fuel.

reed857

I have a map sensor plug in. its pluged in the im "intake manifold" and not the tb "throttle body" I know its not psychic like a mass air flow sensor. gosh why dont hondas have those?

reed857

alright well my memory sucks. I have what looks like 2 map sensors on my tb. one I think is the old style and the one that is pluged in is the new style. I will try and see if I can just plug in the old one and see what happens. problem is I dont have a laptop with me to check and make sure all the a/f ratios are good. anyway any more hints?

reed857

so while the car is on.
removing the TPS raises the idle and increase the vaccum sound
unplugging the map sensor makes the car shut off
unplugging the plug connected to the IACV shuts the car off
unplug the other plug connected to the IM lowers ldle.

will put up pics tomorrow.

gsrboy171

it happend to a friend of mind. it was so funny, you can eat in the car. its your map sensor. you map sensor uses simlar connectors to your idle air control valve. try to switch the two wires around.

reed857

okay so goign along with what the earlier post can you guys help me out with what is what just to be safe. like I said 2 of them when unpluged with the car on will cut it off.




help with this
here is the vaccum box that I have

reed857

any ideas. I think that I still want to get a new map sensor and I have the part number for the one that is plugged in to my vaccum block but just want to amke sure thats what everyone else thinks it is.

qfast817

follow one of those vac lines. you might have a 3bar. also you should be throwing some codes so check the check engine bulb

reed857

I know that I have a 3 bar. and I was pretty dumb not to think that if you have one you dont have the other.

Hawkze_2.3

The green "not sure" looks like an IAT (intake air temp) sensor.

Also if you plug a vacuum leak and the car turns off you need to adjust your throttle body to hold an idle. There's an idle adj. screw on there.

reed857

that would make sense that it would be the IAT. but 2 of the wire plugs when I unplugged them shut the car off. would the tps do that? or the selenoid for the 3bar?

Hawkze_2.3

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reed857 &raquo;</TD></TR><TR><TD CLASS="quote">that would make sense that it would be the IAT. but 2 of the wire plugs when I unplugged them shut the car off. would the tps do that? or the selenoid for the 3bar?</TD></TR></TABLE>

TPS would not make the car shut off...probably wouldn't even change the idle very much. MAP sensor would definately make the car shut off.

reed857

well the one that I had mentioned as the tps I think shuts the car off.

gsrboy171

before you do anything contact your tuner. just make him tell you what to do so it will be free of charge

lthao61

have you checked your coolant level lately?

Slamaccord

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lthao61 &raquo;</TD></TR><TR><TD CLASS="quote">have you checked your coolant level lately?</TD></TR></TABLE>

OMG

reed857

not really sure what coolant would do in this situation (might be my inexperience). mase is my tuner well at least I hope he still is (he has been messing with ford gts and stuff) but I am getting some new **** in the next couple of weeks so I need to get retuned anyways. just didnt know if they sold that map selenoid by itself just in case its going bad

reed857

bump for some defs on these plugs. is it some type of surge selenoid on the IACV? and is that the TPS on the tb? its has to be right?