Warren
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![[*]](./images/xpsilver/default_icon.gif) posted on 3/3/10 at 07:44 AM |
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Unwanted Engine Revs
For the past several days when I decelerate from 65mph, I get a a series of quick revs (almost a pulsing). The revs are about a second and a half in
duration. If I push the accelerator, the pulsing revs stop otherwise it continues. I haven't notice this occurring at any other speed yet, either.
Any ideas as to what might causing this?
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GFresh
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| posted on 3/3/10 at 08:58 AM |
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Faulty Toyota accelerator? Crash it into a tree, sue Toyota and never work again.
Seriously though could it be a timing issue?
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insaneintenti0n
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| posted on 3/3/10 at 09:12 AM |
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my guess, a air leak in a hose
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Warren
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| posted on 3/3/10 at 12:03 PM |
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| Quote: | Originally posted by insaneintenti0n
my guess, a air leak in a hose |
Up by the air intake?
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insaneintenti0n
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| posted on 3/3/10 at 12:27 PM |
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maybe, where i had that issue before was a hose connected from the intake manifold to the valve cover (the PCV, PVC, uh, something valve). I left it
unplugged accidentally once and had that type of issue.
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GFresh
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| posted on 3/3/10 at 12:34 PM |
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I had a brand new PCV valve lying around for the Seo. I think I might have chucked it, but if not I'll send it your way if you need it.
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Tiki_man
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| posted on 3/3/10 at 01:02 PM |
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^ What these guys said it's a vacuum leak. Most likely the PCV valve. It's only a few bucks while your at it replace the grommet arround the PCV
valve to they tend to turn to stone after a while.
Remember the 6 P's: Proper Planning Prevents Piss Poor Performance
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GFresh
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| posted on 3/3/10 at 01:39 PM |
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Yeah mine shattered into tiny pieces and got stuck in the engine, had to take it apart and pull out pieces of plastic (what used to be rubber). Had
someone run out and get me a new one, they came back with a new valve and not the grommet. So I ran to NAPA Auto Parts, they let me try out different
grommets until I found one that fit, cost like $2. That's the new valve I may have recently thrown away.
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Warren
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| posted on 3/4/10 at 09:12 AM |
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Thanks for the advise and the tip on the grommet. I will replace the PCV valve plus the grommet this weekend and hope for the best. I also need to
clean the K&N filter so it looks like my Saturday morning is set. 
Thanks again for the help!
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Warren
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| posted on 3/9/10 at 07:55 AM |
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Changed the PCV valve, grommet, and cleaned out the K&N air filter. Car runs a lot smoother but now the rev issue occurs at 70 rather then 65.
Curiouser and curiouser.
Thanks for the tip on the grommet. It was baked and probably would have crumbled into the valve cover when I tried to put the new PCV valve in. I had
to chip it away and use needle nose pliers the extricate the inside valve portion of the grommet. Kind of like the game of Operation for adults only
different.
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Tiki_man
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| posted on 3/10/10 at 12:29 AM |
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Still sounds like a vacuum leak by your description. Has the intake manifold ever been off? Reason why I ask is a buddy of mine had a torn intake
gasket that took MONTHS to diagnose and repair. The dry intake of the Paseo will almost never give you a problem unless you mess it up at install.
Check the hose leading to the vacuum booster for a leak and any other little vacuum line that you can get your hands on. Sometimes they can be hard
to trace but luckily the Paseo's engine bay is very simple for a fuel injected car.
Remember the 6 P's: Proper Planning Prevents Piss Poor Performance
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Warren
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| posted on 3/10/10 at 07:46 AM |
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| Quote: | Originally posted by Tiki_man
Still sounds like a vacuum leak by your description. Has the intake manifold ever been off? Reason why I ask is a buddy of mine had a torn intake
gasket that took MONTHS to diagnose and repair. The dry intake of the Paseo will almost never give you a problem unless you mess it up at install.
Check the hose leading to the vacuum booster for a leak and any other little vacuum line that you can get your hands on. Sometimes they can be hard
to trace but luckily the Paseo's engine bay is very simple for a fuel injected car. |
As far as I know, the intake manifold has not been off of the engine. I will have to look at an engine diagram to see where the boost is as that might
be where it is.
As long as I have the accelerator depressed everything is great. If I take the pressure off the accelerator at the high speeds, that's when the surge
occurs. No surge occurs at lower speeds when I am decelerating. Also, when I coast is when the issue most occurs. Almost like there is a sensor or
computer not picking up that I am decelerating. I wonder if it is an throttle issue or a MAP sensor issue?
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Tiki_man
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| posted on 3/11/10 at 01:33 AM |
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Could possibly be, but that will most likely throw on a check engine light. If you have the time and ability I'd check as many things as possible and
rule them out.
Remember the 6 P's: Proper Planning Prevents Piss Poor Performance
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Warren
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| posted on 3/11/10 at 08:48 AM |
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There is now a new twist to the problem. When I was coming home on the Interstate last night about 9, I put the right turn signal on while I was doing
about 70 and the "surge" started. I turned off the indicator and the "surge" stopped. I repeated the turn indicator scenario and go the same results.
I usually do have the right turn indicator on when I decelerate off the Interstate and up on the off ramp, so that makes sense. Odd thing though, it
doesn't happen on the left turn indicator only the right turn.
Are Paseo's wired with the turn indicator through a throttle computer?
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benjie
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| posted on 3/11/10 at 02:47 PM |
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| Quote: | Originally posted by Warren
There is now a new twist to the problem. When I was coming home on the Interstate last night about 9, I put the right turn signal on while I was doing
about 70 and the "surge" started. I turned off the indicator and the "surge" stopped. I repeated the turn indicator scenario and go the same results.
I usually do have the right turn indicator on when I decelerate off the Interstate and up on the off ramp, so that makes sense. Odd thing though, it
doesn't happen on the left turn indicator only the right turn.
Are Paseo's wired with the turn indicator through a throttle computer? |
Was your car ever hit on the right side? Pull the indicator lights and verify that something isn't shorted. possibly the hot touching the body
causing a short to the computer. You never know. Or it could be the indicator switch itself.
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Warren
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| posted on 3/12/10 at 08:04 AM |
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| Quote: | Originally posted by benjie
| Quote: | Originally posted by Warren
There is now a new twist to the problem. When I was coming home on the Interstate last night about 9, I put the right turn signal on while I was doing
about 70 and the "surge" started. I turned off the indicator and the "surge" stopped. I repeated the turn indicator scenario and go the same results.
I usually do have the right turn indicator on when I decelerate off the Interstate and up on the off ramp, so that makes sense. Odd thing though, it
doesn't happen on the left turn indicator only the right turn.
Are Paseo's wired with the turn indicator through a throttle computer? |
Was your car ever hit on the right side? Pull the indicator lights and verify that something isn't shorted. possibly the hot touching the body
causing a short to the computer. You never know. Or it could be the indicator switch itself. |
As far as I know, the car has never been hit on the right side. I did replace the head light bulbs on both sides a few weeks ago though. I will have
to take that apart again and see if there is a pinched wire or something of that nature.
It is odd to me that this problem only occurs at 50mph and above. I would think that if it was a short in the wire that it would happen all the time
when the right turn signal is on. I may also look at replacing the turn indicator module in the fuse box.
Thanks for your comment.
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benjie
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| posted on 3/12/10 at 10:03 AM |
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| Quote: | Originally posted by Warren
| Quote: | Originally posted by benjie
| Quote: | Originally posted by Warren
There is now a new twist to the problem. When I was coming home on the Interstate last night about 9, I put the right turn signal on while I was doing
about 70 and the "surge" started. I turned off the indicator and the "surge" stopped. I repeated the turn indicator scenario and go the same results.
I usually do have the right turn indicator on when I decelerate off the Interstate and up on the off ramp, so that makes sense. Odd thing though, it
doesn't happen on the left turn indicator only the right turn.
Are Paseo's wired with the turn indicator through a throttle computer? |
Was your car ever hit on the right side? Pull the indicator lights and verify that something isn't shorted. possibly the hot touching the body
causing a short to the computer. You never know. Or it could be the indicator switch itself. |
As far as I know, the car has never been hit on the right side. I did replace the head light bulbs on both sides a few weeks ago though. I will have
to take that apart again and see if there is a pinched wire or something of that nature.
It is odd to me that this problem only occurs at 50mph and above. I would think that if it was a short in the wire that it would happen all the time
when the right turn signal is on. I may also look at replacing the turn indicator module in the fuse box.
Thanks for your comment. |
You never know sometimes. Changed my shocks last week and ever since I changed them, the car has been squeeking. I was so pissed that I was going to
have to take apart the interior again. Last night I dropped something on the back bench and I heard the same squeak again with the car off. The
plastic tabs that keep the bench in place broke off when I was pulling it out and it's been rubbing metal against metal for the week. Sure sounded
like the suspension but it wasn't. The above 50 mph might be tied to alignment/balancing and at that speed the car might have more vibration. That
is an odd one.
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Warren
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| posted on 3/16/10 at 06:44 AM |
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In today's episode of "As the Crankshaft Turns":
I took the right headlight and turn signal off on Saturday and looked for a pinched or crimped wire. I did not see or feel one, so I reattached them.
I replaced a running light bulb on the rear driver's side (and noticed that the socket was corroded). Took it for a ride and the unwanted rev problem
seems to have disappeared. Yea!
I got in to drive to work yesterday morning and all of the interior lights are now out as well as all of the running lights. I replaced the 15amp fuse
in position number four on the interior driver's side fuse box (the fuse had blown). Unfortunately, that has not remedied lights out situation.
Is there another fuse or connection that I am missing or is it something else that could be wrong?
(p.s. - a big thanks to who ever posted the Paseo Manual online. It is a great source.)
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benjie
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| posted on 3/16/10 at 08:53 AM |
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Did you sand/scrape away all the corrosion or did it look like only the bulb was corroded?
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Warren
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| posted on 3/16/10 at 09:48 AM |
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| Quote: | Originally posted by benjie
Did you sand/scrape away all the corrosion or did it look like only the bulb was corroded?
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The bulb was clean as well as the inside of the socket. Only the outside of one socket (the running light) had the white corrosion on it.
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Warren
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| posted on 4/1/10 at 07:20 AM |
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Update:
I replaced the harness on the left rear tail light and have now stopped blowing up the 15amp fuses. All the running lights and interior light have
come back on.
The rev situation is about the same although it doesn't appear when I get to 80mph (for some reason).
I have noticed recently that when I have the car in reverse, the right turn arrow on the instrument panel appears faintly lit. When I put back in
drive, all is goes back to normal. I have to think that this and the rev problem is related in some way.
I guess eventually some part will break/burn up and I will know what to do in the future. 
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