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| no high idle and won't release to low idle; no high idle at start up | |
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| Tweet Topic Started: Oct 7 2017, 09:36 PM (813 Views) | |
| tteerryy | Oct 7 2017, 09:36 PM Post #1 |
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Elite Member
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Hi Mech friends etc...my green 99 3cyl starts right up --but at low idle and will not turn on the high idle...that's when its cold. Then at engine hot, the idle is around 1200, I know it is supposed to idle more around 6-700 and it looks like the high idle "machine"--can't think of names..is holding it up too high..I started it up and ran it with that unplugged and it was the same. I haven't changed anything recently. I took off the air cleaner the other day to check the filter and there was a bit of oil in the bottom near where the pvc hose comes into the side of it. And...I took out the pvc valve to check it and it is hole through--like you can see right through it. I always thought pcv valves should have a moving internal part that regulates exhaust gases back through the system.. I don't see how this part does anything?? Can anyone explain that too??>> thanks in advance Last year I found a hose that was a larger than the small vacuum type hoses-- this one goes from the firewall to sort of under the throttleBody...it had collapsed and was blocked, Things got better right away with that fix and I did get my high idle and it did kick off...that was lasts year.. Now I get no high idle and no low idle , ...just too high idle... Would really appreciate a map of what to try to test to unplug etc to track it down. I plugged in a cheapie OBD and got a code 0136 |
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| Dystopiate666 | Oct 8 2017, 03:23 AM Post #2 |
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Tree Banger
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PCV .... Positive Crankcase Ventilation, no exhaust gases are passing through ....well, maybe with the oil on the air filter....but it is designed to only pass positive pressure from the crank case into the intake, and yes it should be a simple one way check valve and might slow your oil consumption if replaced.... Are you sure the hose you found blocked was a vac hose and not a coolant hose? I think funny things can happen when the coolant passages in the TB get plugged |
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| tteerryy | Oct 8 2017, 07:58 AM Post #3 |
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Elite Member
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Hey, thanks for the reply, it was last year, but as I remember it, the wasn't any coolant at all in the line I replaced, some dried up hose material on the inside at the collapse point inside the hose that was definitely blocking it..--I'll put up some pics later today...and I don't see and valve in the pcv at all-- it is see through?? |
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| tteerryy | Oct 8 2017, 08:00 AM Post #4 |
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Elite Member
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here's the pic of the hose last year that I replaced..
Edited by tteerryy, Oct 8 2017, 08:13 AM.
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| freegeo | Oct 8 2017, 09:25 AM Post #5 |
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PO136 is for the heater circuit for the rear O2. That won't cause the problems you are having. When you 1st start your car the idle should go up above 1200 rpm's. As it warms up it should slowly go back down to about 850 rpm. Did you replace all the vacuum lines last year when you found the bad vacuum line? |
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| Dystopiate666 | Oct 8 2017, 11:16 AM Post #6 |
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Tree Banger
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I just went out and looked at my 96 to compare. That size hose.....so if you are looking at the top of your throttle body with the breather off...on the left you have two hoses about that size...those are the coolant hoses that cool the TB....a blockage in those lines could cause you drivability issues...not sure about surging or low idle conditions..... If you look to the right of the throttle body...there are two hoses that size coming off of the firewall (actually connected to two hard lines running along the firewall), that connect to two hard lines then, run two soft hoses up to the top of the TB....these are fuel supply and return...a blockage in these hoses could definitely cause your idle to be consistently low. If you had the same symptoms a year ago, I would double check the hoses, the lines that supply them and the passages in the TB that are affected by them (in the case of the coolant lines). for the fuel lines you can disconnect them up at the TB and back at the tank and blow them out with air, for the coolant lines, I would probably use an infrared thermometer and try to catch any restrictions that way first. This would also be a good time to check your fuel pressure and rule that out, very simple with a 25$ gauge from your local parts store or Amazon, I think its supposed to be around 12 psi. I have not dealt with the IAC valves on the metros as I have the newer ISC, but on my ford truck I can clean up the IAC with parts cleaner and affect low idle sometimes. |
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| Metromightymouse | Oct 8 2017, 11:20 AM Post #7 |
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Powdercoat Wizard
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The coolant lines to the throttle body are to heat the TB, not cool it. A restriction in the fuel lines that caused low idle ought to cause major driving issues, or an inability to rev the engine. |
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| freegeo | Oct 8 2017, 12:17 PM Post #8 |
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The fuel pressure for the 1.0 is - Engine off and key in on position = 23 to 30.5 psi Engine idling = 13 to 20 psi |
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| tteerryy | Oct 8 2017, 02:41 PM Post #9 |
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Elite Member
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Hey...thanks for those ideas and info.... I checked the lines and hoses this morning and can't find any restrictions. I took off any easy elec connectors and gave them a bit of dielectric grease, just to be sure that that wasn't a problem. hey were all very clean and nothing changed as a result.. So good maintenance maybe, but connectors aren't the problem .The hose that was crimped last year does go over to a hard line along the firewall, but it is definitely going over to the vacuum line going into the the master cylinder brake booster. That's the other symptom I was getting last year, the brakes felt very hard and so then that hose replacement restored the brake booster vacuum function. . Anyway, ...this morning it did start up with a higher idle and went down as the engine warmed. I backed the idle stop screw out a half turn so now I am idling at 1k with engine hot. It'll be interesting to see how it acts when it gets actually cold, maybe that'll make more clear what going on.. Don't think fuel is a problem because it functions as expected at all times, in terms of reving etc. ...OH...I know what happened!!...when I put in the Canadian speedo cluster, it made the car idle at Canadian rpms...those doggone Canadians! Edited by tteerryy, Oct 8 2017, 02:43 PM.
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| MR1 Kingsbury | Oct 8 2017, 03:01 PM Post #10 |
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Exp. builder/rebuilder
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you adjusted the idle stop (do not tamper) screw??? the one with a 3/32 allen key and 9/32 locknut? Oh no... You might have more trouble with this yet. |
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| tteerryy | Oct 8 2017, 03:18 PM Post #11 |
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Elite Member
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yeah...I know that in general its a no touch item, but I wanted to see the result. I can put it back, I know exactly how much I turned it.... My gut tells me that it is the high idle mechanism that isn't "turning all the way off" once the engine is warm.... here's some pics...maybe you'll see something that I don't or don't know to look for..and again, thanks for help and replies. Here's the hose I did last year that goes over to the master cylinder brake booster housing. ![]() see what you see... ![]() I'm thinking that the top curls on the two springs should be against the posts that they wrap around, but they are both off by like a quarter inch ....no they shouldn't I think now...they are at rest.. ![]() ![]() ![]() ![]() is this plastic spacer shrinking away and maybe leaking?? that should be easy enough to rule out just listening maybe? ![]() there's a metal vacuum line that starts and goes no where at the other end.. ![]() Edited by tteerryy, Oct 8 2017, 05:09 PM.
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| freegeo | Oct 8 2017, 06:28 PM Post #12 |
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That black plastic spacer is the efi heater. It does have gaskets on both sides of it, but usually they don't cause a problem unless they short out and blow the fuse.
Edited by freegeo, Oct 8 2017, 06:29 PM.
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| MR1 Kingsbury | Oct 8 2017, 06:57 PM Post #13 |
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Exp. builder/rebuilder
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I'm not seeing the fuel evap canister? should be right there (in the last photo) with 3 different size hoses connected... Unless they did away with it after 98. Thinking the steel line had a hose connected there |
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| tteerryy | Oct 8 2017, 08:22 PM Post #14 |
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Elite Member
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Hey thanks...I was of course wondering if anyone knew.. thank you too Tom Edited by tteerryy, Oct 9 2017, 10:18 AM.
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| suzukitom | Oct 8 2017, 09:03 PM Post #15 |
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Tom
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Evap cannister is in the back by the gas tank |
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