new plugs causing high RPM across the board?
#1
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new plugs causing high RPM across the board?
I switched from Bosch Platinums back to NGK V-power (all .042) like I ought to have been using all along. Only 4000 miles if that on the Bosches, but they stole power so I decided they had to go. However, my car (1990 GXE, VG30E) used to idle 750 steady, and after the plugs it idles 900 with a few dips and jumps every now and then. The car idles up to 1700 during the first 10 seconds after start, a 200rpm increase and even when in gear and moving 45mph, RPM seems higher than usual.
Mainly I want to know how come my at-speed RPM seems higher. It seems to me that no matter what the plugs were, that RPM/MPH should be uhchanged by anything in the engine. So is the idle an a dirty TB and dirty/maladjusted IACV thing, and the tranny (a/t) causing the high operating RPM by maybe not locking up in 4th or what? I used to run 1800-1900 @45mph in 4th now i'm almost always over 2k unless I'm coasting.
I'm going to clean TB and IACV and MAF a little later, probably at Aaron's, and we'll set idle and all that stuff then.
Mainly I want to know how come my at-speed RPM seems higher. It seems to me that no matter what the plugs were, that RPM/MPH should be uhchanged by anything in the engine. So is the idle an a dirty TB and dirty/maladjusted IACV thing, and the tranny (a/t) causing the high operating RPM by maybe not locking up in 4th or what? I used to run 1800-1900 @45mph in 4th now i'm almost always over 2k unless I'm coasting.
I'm going to clean TB and IACV and MAF a little later, probably at Aaron's, and we'll set idle and all that stuff then.
#4
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Originally Posted by MyGreenMax94
Oh,one more thing,unplug and check every harness plug on the engine for corrosion..[green looking crap on the terminals]...
What's the connecor directly next to the VSS connector? It was disconnected when I bought the car...
either way, would that have any bearing whatsoever on the high 45mph RPM also? if the variable TPS were dirty I could understand that, since it would maybe think I was using a throttle position that didn't warrant lockup, but I'm not sure that the hard-TPS one would do the same thing preventing lockup.. but I may buy a whole new TPS anyhow. Does Brian sell TPSs?
#5
Originally Posted by capedcadaver
What's the connecor directly next to the VSS connector? It was disconnected when I bought the car...
Originally Posted by capedcadaver
either way, would that have any bearing whatsoever on the high 45mph RPM also? if the variable TPS were dirty I could understand that, since it would maybe think I was using a throttle position that didn't warrant lockup, but I'm not sure that the hard-TPS one would do the same thing preventing lockup.. but I may buy a whole new TPS anyhow. Does Brian sell TPSs?
#6
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Originally Posted by MyGreenMax94
back up lights? got a pic?
Originally Posted by MyGreenMax94
You may be experiencing the begining of the dreaded vg auto death ritual..
#7
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Originally Posted by MyGreenMax94
back up lights? got a pic?
#10
Originally Posted by capedcadaver
but you already have a VE-5... whatchu want a VG tranny for?
will a dying a/t also have a higher RPM under coasting too (maybe from some oddity concerning the stator's RPM, perhaps, due to other miscues inside the tranny)
will a dying a/t also have a higher RPM under coasting too (maybe from some oddity concerning the stator's RPM, perhaps, due to other miscues inside the tranny)
Send the pic to paint/red arrow the part/ctrl-w,reduce size to about 70%..
#15
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Originally Posted by MyGreenMax94
Knock sensor harness plug...
not trying to argue, I was just checking your result against mine.
is the o2 sensor connecter underneath the engine kinda, like, by the steering rack?
#17
Originally Posted by capedcadaver
i actually just checked the FSM. I think maybe you are thinking on your VE unless the FSM is wrong... because the KS plug on the VG is supposed to be alllll the way over on the cyl#2 end. According to the diagram on EL178 it says it's the oil pressure subharness. umm. I'll disconnect it and check for a light though. maybe it was just unseated from the mount but still connected. either way the funky high RPM was the more important part of this post.
not trying to argue, I was just checking your result against mine.
is the o2 sensor connecter underneath the engine kinda, like, by the steering rack?
not trying to argue, I was just checking your result against mine.
is the o2 sensor connecter underneath the engine kinda, like, by the steering rack?
I was just guessing at it..
IIRC,The 02 sensor plug is by the firewall on the passenger side..Just crawl under there and trace the wire to make sure..
#18
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Originally Posted by MyGreenMax94
You may be experiencing the begining of the dreaded vg auto death ritual..
startup, thru gear selection
driving home some (that ratcheting sound is the sticky worm gear motor for the odometer. it wasn't counting miles whenever it was ratcheting like that. I replaced it from the cluster I got my other speedo from, and now it works.)
note that my car accelerated willingly at 1950ish RPM in 4th from 43-47, yet my car currently needs about 2100RPM to sustain 45mph. When coasting, my car in the video dropped below 1500rpm @ 45mph (manuals don't do that, I don't think) but currently I run lik 1700-1800RPM coasting @45mph.
I'm going to take more videos tomorrow morning, to verify what I just said.
the videos are uploading right now. check back for them at about 15 minutes from the posted time and at least the first one will be done
#19
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Originally Posted by capedcadaver
the videos are uploading right now. check back for them at about 15 minutes from the posted time and at least the first one will be done
#20
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Originally Posted by capedcadaver
the videos are now ready to watch
40mph, 1100rpm down the hill. picked back up 40mph 1600rpm. climbed the hill in 4th gear, 2000RPM tops, holding dead-on at 35mph up the hill.
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