1500 rpm surge plz help!!!
Plz help!!! My 98 Civic with the d16y7 will not stop surging at 1500-1600 rpm. It started a few months back, I had a bad water pump leak and I suspected the surging had something to do with my iacv. I've since deleted my iacv, replaced my water pump and timing belt. Still the surging presisted. I've now replaced my pcv valve, tps sensor, spark plugs, and I've checked for vacuum leaks using electrical cleaner in a spray can... Yet still the engine still surges/jerks between 1500-1600 rpm and feels kind of sluggish. I'm going to replace my distributor and plug wires tommorow, as I have a 92 ex d16z6 donor car. I'm hoping this helps but I'm kind of doubting it.. does anyone have any other ideas as to what else could possibly be causing the engine surge??? Plz help I'm almost at my witts end with this issue!! Thanks!!!
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Re: 1500 rpm surge plz help!!!
Quick update, after posting this I went to mess with my idle screw, only because I have low idle due to my iacv delete, and it seemed to kind of help the surging issue. It's still there however, maybe not quite as bad, but I don't think it has anything to do with the idle screw being as the surge isn't happening on idle, it's at 1500-1600 rpm. Just wanted to throw that out there. Again, thanks in advance any help is much appreciated!!!
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Re: 1500 rpm surge plz help!!!
Does the D16Y7 have a FITV? If so, I'd look check the adjustment on that.
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Re: 1500 rpm surge plz help!!!
Originally Posted by DaX
(Post 51842546)
Does the D16Y7 have a FITV? If so, I'd look check the adjustment on that.
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Re: 1500 rpm surge plz help!!!
Originally Posted by Joey Mitchell
(Post 51843077)
The FITV was located on the backside of the iacv, so it also has been deleted from my TB.
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Re: 1500 rpm surge plz help!!!
Originally Posted by tony_2018
(Post 51843137)
huh?
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Re: 1500 rpm surge plz help!!!
If it could run properly without an IACV, Honda wouldn't have spent the money to put one on every Civic.
When my IACV failed, it was of course not idling well, also it was really hesitant and jerky taking off from a stop or putting along in slow traffic in first.gear. So I did the obvious thing and replaced the IACV with a good one. |
Re: 1500 rpm surge plz help!!!
Originally Posted by mk378
(Post 51843547)
If it could run properly without an IACV, Honda wouldn't have spent the money to put one on every Civic.
When my IACV failed, it was of course not idling well, also it was really hesitant and jerky taking off from a stop or putting along in slow traffic in first.gear. So I did the obvious thing and replaced the IACV with a good one. So OP, why did you remove the IACV ??? Also, the FITV is a mechanical idle up device that is found bolted to the bottom of the T/B on a '92-95 Civic or '94-95 Integra. '88-91 Civic/CRX's have the FITV bolted to the intake manifold UNDER the T/B. How about posting a picture of your intake manifold and how you deleted the IACV and FITV. |
Re: 1500 rpm surge plz help!!!
Which was why I'm confused at why he said he had an FITV unless the throttlebody is from the 92-95 civic/94-95 integra.
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Re: 1500 rpm surge plz help!!!
https://cimg0.ibsrv.net/gimg/honda-t...6601b5f615.jpg
https://cimg6.ibsrv.net/gimg/honda-t...58899e0c9e.jpg https://cimg8.ibsrv.net/gimg/honda-t...8e0673abd1.jpg https://cimg7.ibsrv.net/gimg/honda-t...6d6b566001.jpg These are photos of my iacv. I was mistaken, the 2nd photo shows what I thought was a FITV, but it's just an adjustment for the iacv. I deleted it by simply screwing a piece of sheet metal over the hole where the iacv originally sat, and I made sure to use the rubber seal that was on my iacv so that my patch didn't leak. Then I just looped the coolant hoses that went to the iacv together. At the time I had a bad water pump leak I was experiencing all sorts of idle issues and that's why I deleted it to begin with. I was running straight water in my coolant system and it froze over a few times, good ol cold NC mornings and I was afraid I may have broken my iacv. However, upon inspection of my iacv now it seems to function properly, I mean it spins by hand freely and it closes off as it should when I try to blow through it. So my question now is should I just clean my iacv and replace it to try and solve my 1500 rpm surge issue, or should I go buy a new iacv all together? I have replaced my water pump and timing belt now and I am running antifreeze in my coolant system. I know I will have to re-bleed the coolant system of air when I replace my iacv I just don't want to waste the time of putting my original iacv back on of there is a possiblity of it being broken in a way that I can't tell by physically inspecting it. Thanks for all the help, guys. |
Re: 1500 rpm surge plz help!!!
Also, please don't rag on my shitty carpet. Lol
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Re: 1500 rpm surge plz help!!!
An IACV would have an electrical coil inside of it so that the ECU can control the rate of air flow that bypasses the T/B. Does the device that you have pictured have some port for an electrical connection ??? If not, it would be considered a mechanical FITV. The way that these work is there is a simple air leak when the water temperature is cool... once warmed up, the wax bowl inside softens and allows the piston inside to seal thus cutting off the air leak.
This doesn't look like an IACV from a '98 D16Y7... is it damaged or is some part missing ??? There really should be a 3-wire electrical port. |
Re: 1500 rpm surge plz help!!!
Originally Posted by JRCivic1
(Post 51844077)
An IACV would have an electrical coil inside of it so that the ECU can control the rate of air flow that bypasses the T/B. Does the device that you have pictured have some port for an electrical connection ??? If not, it would be considered a mechanical FITV. The way that these work is there is a simple air leak when the water temperature is cool... once warmed up, the wax bowl inside softens and allows the piston inside to seal thus cutting off the air leak.
This doesn't look like an IACV from a '98 D16Y7... is it damaged or is some part missing ??? There really should be a 3-wire electrical port. |
Re: 1500 rpm surge plz help!!!
Yes put it all back together.
You don't necessarily have to hook up the coolant lines though. They don't do anything except in very cold weather. |
Re: 1500 rpm surge plz help!!!
Check your tps that has a lot to do with idle not iacv or whatever you call it
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Re: 1500 rpm surge plz help!!!
Originally Posted by mk378
(Post 51844256)
Yes put it all back together.
You don't necessarily have to hook up the coolant lines though. They don't do anything except in very cold weather. |
Re: 1500 rpm surge plz help!!!
TPS brotha
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Re: 1500 rpm surge plz help!!!
Originally Posted by 93hondacivic91
(Post 51844389)
TPS brotha
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Re: 1500 rpm surge plz help!!!
First off explain what you mean by surging. Second off to remove the cel all u got to do is remove the ecu fuse under your hood for a few minutes and its gone. Ever time i go over 6500 rpm my cel goes so i just remove the ecu fuse under hood and wam bam its gone. Also my cel was on due to a high idle idk if thats what your dealing with. Let me know ☺
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Re: 1500 rpm surge plz help!!!
that specific iacv is calibrated, I dont THINK you were suppose to separate them.
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Re: 1500 rpm surge plz help!!!
Originally Posted by 93hondacivic91
(Post 51844402)
First off explain what you mean by surging. Second off to remove the cel all u got to do is remove the ecu fuse under your hood for a few minutes and its gone. Ever time i go over 6500 rpm my cel goes so i just remove the ecu fuse under hood and wam bam its gone. Also my cel was on due to a high idle idk if thats what your dealing with. Let me know ☺
Originally Posted by tony_2018
(Post 51844438)
that specific iacv is calibrated, I dont THINK you were suppose to separate them.
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Re: 1500 rpm surge plz help!!!
Its just idling bro give or take thats a constant idle but if you got a cel then theres something wrong get the code and fix it asap try not to drive too irratic if you know what i mean
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Re: 1500 rpm surge plz help!!!
Originally Posted by 93hondacivic91
(Post 51844471)
Its just idling bro give or take thats a constant idle but if you got a cel then theres something wrong get the code and fix it asap try not to drive too irratic if you know what i mean
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Re: 1500 rpm surge plz help!!!
So we might have the same issue, mine surges but i aint trippin about that, my main concern is the cel. So have u replaced the iacv?
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Re: 1500 rpm surge plz help!!!
You mentioned you replaced the TPS, but you don't have a multimeter. TPS needs to be calibrated using a voltmeter, 0.5v closed and 5.0v at WOT if I recall correctly.
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