Question about 1993 Buick Regal

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Checked tps it is working on stem ok but

Checked tps it is working on stem ok but developed a small miss after changing it idles and runs oh higher speed miss have replaced plugs and wires and checked fuel injectors with ohms do you have a suggestion

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  • Buick Master
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TURN OFF RADIO FIRST.REMOVE NEGATIVE BATTERY CABLE FOR A MINUTE OR TWO.RECONNECT NEGATIVE BATTERY.CRANK CAR UP LET IDLE TO GET OPERATING TEMPERATURE FIRST DONT ACCELERATE ENGINE.GIVE ENGINE TIME TO RECOGNIZE THE NEW TPS SENSOR.IF CAR STILL MISS REPLACE FUEL FILTER.CLEAN FUEL INJECTORS WITH A BOTTLE OF FUEL INJECTOR CLEANER BY POURING IT IN A FULL TANK OF GAS.DRIVE CAR AROUND SO CLEANER CAN FLUSH OUT THE INJECTORS.

Posted on May 15, 2010

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Truck calls when I give it gas


You may have a bad TPS or throttle position switch. You might be able to borrow a fuel pressure gauge and check the pressure at idle. You can disconnect the TPS leads and put the Ohmmeter leads into the TPS(Not the truck harness}. The Ohms should change smoothly as the TPS is opened.

The Crankshaft position sensor is suppose to change the voltage to the fuel pump to increase pressure for the higher RPM. If the fuel pressure does not increase the engine will lean out and die.

While a bad cylinder can stall an engine at idle, most can run at higher RPM a cylinder short.

Scanners- You need a "check light" for the cheaper scanners to work. But a good scanner bypasses the onboard computer and allows the Technician to directly question the same sensors through the cars' wiring. Such that the outside scanner can do much more than the onboard computer.

Please rate my info.

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I HAVE A 1988 GMC 5.7 V8 PU...IDLES UP & DOWN WHEN COLD...SURGES...NO POWER COLD...RUNS GOOD AFTER IT WARMS UP...NO CHECK ENGINE LIGHT...TIMING CHECKS OK...PARTS ALREADY CHANGED:...COIL-PLUGS-PLUG...


Remove the vacuum lines on the bottom front of the throttle body with the engine off. Check each hose connection with a nail; small screwdriver or a small drill bit. Make sure they are not clogged. If they are clean them out carefully. If they are not clogged, then check to make sure the vacuum lines aren't obstructed. I refer to your idling up and down as hunting. Reconnect the vacuum lines and start the engine. If it idles smoothly, your found your problem. Good luck.

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My 305 tpi stalls when I come off the highway, restarts no problem and runs and idles fine? what could be the problem. It has been sitting all winter with a full tank of 91 octane fuel.


I'd run a good fuel system cleaner through it and change fuel filter & plugs. Even w/high octane fuel, it still develops a varnish and plugs from sitting have probably have small amounts of corrosion on tips from condensation.

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Wiring diagram for the ecm plugs


Im idling at the light in my 2000 Dakota R/T and all of a sudden my check engine light comes on and the engine develops a miss and starts to smoke. Diag code says misfire in #5 cyl and there is a rich raw fuel smell from exhaust. I have 175K trouble free miles and have checked compression which reveals worn but good piston rings.I replaced head gaskets and of course still exists. When I got a hand to crank while I checked voltage at each injector, #5 showed higher than the rest at all times without dropping to zero, so i'm replacing the ECM which controls signals to injectors. Oh yeah I replaced #5 injector before voltage check to no avail. Tell me if you think Im on the right track replacing ECM.

Oct 02, 2010 | Dodge Grand Caravan Cars & Trucks

1 Answer

After replacing tps developed small miss at high speed over 40 mph tried another one same problem


I don't think I would replace a tps for the small miss at high speed, although it may have seemed plausible at the time.

I only replace the tps when it shows degradation on the scanner.

Does your computer detect the miss on any given cylinder? If so, that's where I would look next.

Have you tune up your car lately with spark plugs, wires, air filter, fuel filter?

Jul 04, 2010 | 1993 Buick Regal

1 Answer

Weird Toyota Paseo idle problem


So far everything you tell me is normal, the A/C being triggered requires the engine to turn a compressor to get the system working, and on a small 4 cylinder engine, to get enough power to turn it and not stall requires revving the engine a bit more to get more horsepower. But i must admit that the normal idle RPMis a bit low. The best quick fix i got for you is to rotate the TPS sensore a bit. If you wander what TPS means, it means Throttle Position Sensor. You can usually find it easily, since it is attached to the throttle butterfly. So if you're not sure where all that is, start by locating the wire that comes out of the gas pedal, it will lead you straight to the throttle butterfly, and the TPS sensor. Oh, and it usually looks like a small black plastic box by the way. Once you found the little TPS sensor, you need to loosen the screws/bolts holding it in place (usually there are only 2 screws holding it) but don't take them off completely though, just loosen them. Now you should be able to turn the TPS sensor a few degrees either way. Start the car and idle it in park. Now go under the hood and turn the TPS sensor one way to see what it does, one way will get the engine idle lower, and the other way will make it idle higher. Just turn it until you get around 1000 RPM on park and tighten the screws again and you should be fine for a while. Hope this helps.:)

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1 Answer

1990 f150 w/5.8 FI motor, idles good, take on road, it boggs down


Have you changed the tps? The tps is like a dimmer switch with the idle being the lowest setting and everything above that being progressively stronger. If the switch is bad it will not advance spark or gas flow.

Apr 23, 2009 | 1990 Ford F250

1 Answer

1994 bonneville misses especially at speed and acellerating


good chance you may have a bad coil, you can check by disconnecting the plug wires at the coil to see if your getting any spark, if your not seeing any spark when car is running your coil is bad. be sure to do disconnect the plug wire when engine is not running and key is off!
New coils run around $26.00 easy to change out, you only need a nut driver, 2 small bolts.

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1 Answer

Engine miss above 2000 rpm


sounds like a valve problem. check compression running and non-running. valve sealing at higher rpm is usually a valve spring problem is if runs ok at idle.

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5 Answers

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The reason it's stalling out is because of the adjustments you made to the CAS and TPS. You need to reset the CAS where it was, since when you rotate this sensor, you change the ignition timing. As for the TPS, that also needs to be reset to how it was. The way to adjust the idle on this engine is with a screw on the idle air control valve (IACV). At the back corner of the engine, on top on the driver's side, the IACV is bolted on. If you crouch down next to the driver's fender and look straight in at the IACV (with a flashlight) you will see a screw recessed in there, with the head pointing toward you. That's the idle adjustment screw. With the engine running, AFTER you have reset the CAS and TPS, turn this screw until you are able to set a warm-engine idle of roughly 750 RPM. Messing with TPS voltage and ignition timing is a sure-fire way to stall or blow up your engine.

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