Question about 1994 Toyota Tercel

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Car surges at idle and in gear it almost wants to turn off

I have checked for vacuum leaks but cant find anything. timing is good. i had to ajust my idler screw to get a higher idle or else it would turn off. there is no check engine light on. it is runing rich. i have changed fuel filter. ihave cleaned my intake manifold from corbon buildup, and nothing seems to work. at running speed it seems to work just fine, but i still get bad fuel milage

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Throttle position sensor

Posted on Oct 08, 2009

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2 Answers

1999 chevy van, 7.4 v8 eng. surges and wants to dye out at idle, otherwise ok. possible causes?


fuel line, with that you most likely got ( gross, oh goodness, eww, yucky) sludge in the tank that is most likely in the lines as well. did the van sit for a long time. if so the first thing u do is drain the tank an put new fuel in it so sludge (dirt) don't happen. hope i helped good luck

Sep 05, 2015 | Cars & Trucks

1 Answer

Which valves may need adjusting for engine surge, intake and exhaust or the iac or evap valves?


Maybe neithr. U cud hav a vacuum leak..like a worn egr valve or dirty idle control passage. Only ajust valves on a normal engine. If symtoms go away w increase speed...then its vacuum

Jun 17, 2015 | Cars & Trucks

3 Answers

What causes rough idle an surge?


By what you are saying I would think its the idle control valve.

Apr 30, 2015 | 1996 Oldsmobile Aurora

1 Answer

When I start my odyssey it starts surging. I found a small rubber hose on the right side of the engine, but don't know where the other end of the hose goes....Help


WHAT COUNTY???????????????????????????????????
hot engine, cold or both?/// a key question
WHAT ENGINE: ( usa list , ONLY)
2.2 L F22B I4
2.2 L F22B6 I4
2.3 L F23A I4 2.3 L F23A7 I4
the fsm covers this. hose thing.... all hose can be followed,
unless its axle vents on 4wd cars. (they go no where, special)
is surging the only symtom.?
no engine stalls.?
lack of power in any gear or hills.
no misfiring?
no flooding.?
starts easy/?

ok what is surge, that it really is idle controls bad or out of comtrol
1: idle controls bad. (isc dead?)
2: or engine is running way too lean, and ISC cant keep a grip on idle.

easy huh?
and #3 misfiring so bad the idle controls fail.
are all fuses good?
is the CEL lamp glowing , then goes out running engine.
no , the scan it. or do the flash DTC codes trick.

a good tech ,first finds out if the engine holds closed loop status
hot. at idle, if not, he fixes that first.
as he/she knows that idle is the last thing to work right, in EFI.

one other way to get surge is air leaks (aka. vacuum leaks)
if the engine (unsaid option) is MAP based, it will race fast
with any vacuum leak, and it dont take much of a leak
to make the ISC idle controller go nuts.

so repost , hot/cold both questions
and actual RPM numbers. we need numbers
is the dash Tachometer missing. ????
and what engines in car.

all lean engines surge.
all ISC systems can surge if out of control , not all do this. just 1/2
if the ISC surges, it means its trying hard to gain back control.
this is called a software servo loop.
The ECU is programmed to hold rpm near say 800 RPM hot.
and is very digressive in that role.
I have a 91 car that will surge, with any vacuum leaks.
(by design) depends on which engine.

Feb 15, 2014 | 1995 Honda Odyssey

1 Answer

Idle surges


surging problem could be vacuum leak check all vacuum hoses on intake manifold.hook vacuum gauge to check engine vacuum could have intake manifold leak or could have bad spark plugs and wires.distributor cap and rotor need replacing.ignition timing off.if all is good clean fuel injectors and change fuel filter.if fuel pressure low or pump failing engine will surge real bad.if your air flow sensor bad or egr valve bad the check engine light will turn on.best have vechicle hook to code scanned check emission control system.many things cause engine surge dirty fuel injector faulty fuel pressure regulator have vechicle code scan to save from guessing spending way too much money.

Nov 19, 2013 | 1996 Acura TL Series

1 Answer

97 expedition 5.4 doesnt idle very good


Surging idle is usually caused by vacuum leaks. Ford 5.4L engines are notorious for the PCV hose elbow leaking back behind the throttle body.

The PCV tube goes from the right (passenger) side valve cover and loops around behind the valve body. Inspect this hose on BOTH ends.

Feb 21, 2012 | 1997 Ford Expedition

1 Answer

ENGINE IS SURGING AND WONT IDLE


The MOST LIKELY cause of an engine surging and refusing to idle is a vacuum leak. Check all vacuum line connections. You can also pinch rubber vacuum hoses off one at a time near the intake manifold to see if the engine idle changes, - don't forget to check the hose to the brake booster. If pinching off the booster hose fixes the running problem it is possible that the booster itself is leaking if you can't find any leak in the hose.

You can check for vacuum leaks at the intake manifolsd gaskets and throttle body base by squirting some carburetor cleaner around these areas. If you spray this into a vacuum leak area, you will hear a change in engine RPM.

Aug 16, 2011 | 1994 Chevrolet S-10 Blazer

1 Answer

Why does my 1989 chevrolet s10 surge and idle up


You may have a bad idle air control valve, I would also check for a vacuum leak, from a vacuum hose or a broken vacuum tee.

Jul 14, 2010 | 1989 Chevrolet S-10 Blazer

2 Answers

1997 Nissan Hardbody has rough idle/surges/stalls


ok i have the same truck my timing was off 3 teeth but mine wouldn't kick out of high idle is y mine was surging but know with timing right no vacuum leaks i cant get it below 1400 but when a vacuum turns on it almost kills my engine any thoughts i know i got a vacuum line mixed up idk were though

Mar 13, 2009 | 1997 Nissan Pickup

2 Answers

Check engine light is on and high idle (1500rpm)


Some times the E.G.R. will stick half open. This will make the engine surge or have high idle. Try replaceing the E.G.R. located under the upper intake. Do not go with after market E.G.R. The spring in them are to powrefil and the E.G.R. wil not open. Also try replaceing the O2 sensors. This could give the engine more fuel thus a higher idle. Some vehicles the T.P.S. can be ajusted, do some checking to see if yours is adjustable.

Please contact me if your problem presists.
Thanks, Charlie

Feb 03, 2009 | 2000 GMC Jimmy

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