Question about 2003 Buick Rendezvous

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I am having the same issue with p1635 where my engine under idles for which it use to over idle then i took it ta a mechanic and he said he over passed something and now its back but its under idleing now when my foot is off the gas ans worst of it starts doin it at quarter tank and keeping the truck on is a pain!!

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: buick lesabre nightmare

Need to get a scan tool and look at the data stream while it is running for alot more info.Also any trouble codes.Sounds like initially,the engine isn't getting any fuel.I would have a pressure gauge connected to the fuel rail on the engine,so i could monitor the fuel pressure while all this is going on.Items to look at on the data stream would be timing,what timing is the PCM commanding for the engine.Also,have you checked for continuos power feed to the coils during this no start condition,and fire at the plugs while cranking.You could possibly still have spark,but maybe it is extremely weak?I have seen bad ignition switches cause weird problems before too.Many things power up through the ignition switch,just a thought.Have also seen bad PCM's cause strange problems..38 volts is a little on the low side for GM.Usually see those at,at least .50 and up,and rise steadily while pressing the throttle,up to just under 5.0 volts.Potentiometer with 5 volt supply.Vacuum leak can be checked with engine running at a steady idle speed,spray brake cleaner all around the intake manifold and listen for engine speed change.

Posted on Jul 31, 2008

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SOURCE: buick lesabre no start

Hi you have replaced allmost everything ,(try fuel pump relay)

Posted on Aug 18, 2008

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SOURCE: rough idle

fuel filters rarley cause idle problems. i would look at the egr valve or possible vaccume leaks.

Posted on Aug 24, 2008

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SOURCE: High Idle Problem

did you replace the iac motor or the tps , iac is the idle air control and the tps is the throttle position sensor

Posted on Nov 12, 2008

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SOURCE: The car keeps dying!

check your oxygen sensor

Posted on Jan 05, 2009

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Coleman Powermate 8125 6250 with a Honda GX390 Engine. At idle speed, I'm getting roughly 120V out of the Generator.

I am not familiar with your generator but mostly there is no idle speed on a generator. When started the engine would usually run at a preset speed from the first - this is so the Hz or c/s per second of the output is correct.

When an electrical load is applied to the output there would be a tendency for the engine speed to slow and it is the job of the governor, whether mechanical or electronic, to return the engine speed to the preset value as quickly and smoothly as possible.

A mechanically governed engine does give an (incorrect) impression it speeds up when a load is applied but in reality it is only returning to the preset speed.

The engine speed of a generator should not be tampered with unless an accurate Hz meter is available - the only method of checking/adjusting the engine speed of a generator.

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3.5L V6. Why does oil pressure light turn on intermittently?

1. As a basic measure I would make sure the correct grade and spec oil is going in the engine. You can no longer trust that a local mechanic or even a dealer service center will necessarily use the required product as stipulated by the manufacturer. It is always better to buy and supply your own so you know the correct product is being used.

2. I would not assume there is a problem with the oil pressure warning light even though there could be.
The first thing the mechanic should have done when you reported the oil pressure issue is to hook up an independent mechanical oil pressure gauge and check oil pressure when the engine is hot at different RPMs. Any oil pressure issue will usually show up at idle when the engine has been warmed up properly and the engine oil is hot (unless you have some kind of intermittent oil pressure relief valve that is sticking). Just replacing parts without actually knowing what the oil pressures are at different RPMs is being sloppy and negligent.
This is what you need to do now. Contact a business that can hook up their own pressure gauge to your engine and have them check the oil pressure readings at various RPMs when the engine is fully warm. If there is a low oil pressure issue it will show up on the oil pressure gauge. As you have a new oil pump there should be no issue now with oil volume or a sticking oil pressure relief valve which on your engine should be part of the oil pump assembly.

3. Worn engines will not be able to sustain required oil pressures. Oil pressure is not produced by the oil pump. The oil pump produces oil flow but the resistance to flow is what produces the oil pressure and that resistance is created by fine clearances between operating engine parts especially on the crankshaft and components connected to it. Once the engine wears the clearances increase and the oil flows past the parts much more easily and produces/builds much less pressure.
How well your engine with over 90000 miles has been maintained depends on how often all the owners changed the engine oil and filter , whether they kept the engine oil level up to full (most owners rarely ever check oil levels between services) and whether they always used the correct product. Manufacturer oil change intervals shown in service schedules can be 10000, 12000 miles or more which is much too infrequent for the type of use 95% of private vehicles experience which typically are on the severe to very severe use end of the spectrum. Engine oil typically needs to be changed at least at half the mileage shown in service books (at least twice as frequently) and thus at least every 5000 miles if you want your engine to last.

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Chevy Tracker 2001-not idling correctly when I stop at light. Took to a local mech he said he thought it was sensor and something where it was getting too much fuel and wanting to flood out. Runs fine...

It sounds like it's your IACV, ( Idle Air Control Valve). This part is not cheap, costs over $200.00. I would recommend that you take it to a mechanic that you trust and have them clean the valve for you. The Idle Air Control Value has a pintle that steps/moves in and out to adjust the Idle of the engine, this pintle gets carbon build up on it and causes Idling issues. I would start there. Hope this helps.

May 21, 2017 | Cars & Trucks

1 Answer

I have a 2008 kia spectra engine light stays on took it to auto zone code poo11 one of 4 causes 1.) blocked oil passage 2.) low oil pressure 3.) failed crankcase actuator 4.) michanical timming issue I...

For this code, you have to remove the valve cover and inspect the camshaft timing mechanism. If there is sludge under the valve cover, you need to desludge the whole engine. Remove clean, and inspect the cam timing mechanism for damage. After reassembly, make sure it springs back to the idle position.
the adjuster/solenoid is shown below. It has a valve that the pcm opens and closes rapidly to control the advancing of the camshaft using oil pressure.


Aug 31, 2017 | Kia Spectra Cars & Trucks

1 Answer

Car accelerates by itself; idles way too fast

Focus on the P1635. The pcm is not providing a valid reference voltage to the sensors. Therefore, the sensors are unable to provide feedback to the pcm. This problem can be the pcm itself or a short somewhere on the wire that is supplying the reference voltage. I would unplug the sensors and then check to see if the reference voltage comes up to spec (5vdc). If it doesn't, trace the wires looking for a short to ground. No short--replace pcm. If you find a short, repair. If the voltage meets spec with the sensors unplugged, plug them bacl one at a time checking the voltage after each one is plugged back in until the voltage drops. When it drops, you have found the sensor that is the source of the short. Am I making sense? Then put your old tps back on.

Jul 11, 2017 | 1996 Oldsmobile Cutlass Ciera

2 Answers

2004 dodge ram 1500 hemi 5.7 engine dies when stopping, or idles irradic at low speeds when accelarating

Check/clean the MAP sensor and throttle position sensor. This should fix the issue. Its a common problem with Chrysler products.

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The problem: 2001 mitsubishi galant es will not continue to run first start up in the morning

For idle issue,click the help links provided below :---

Bad miss at idle? Engine stumbles coming off idle when warm?


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Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

High rpm in neutral? Inconsistant high RPM in neutral?

Erratic idle on car?

Low idle when cold out side?

Idle Air Control (IAC) Valve Replacing?

intermittent engine failure while idle?

Engine quits at idle?

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Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

Click this link below and follow the troubleshooting:------


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3 Answers

I have a 2000 volvo s80 when im idling or stepping on the brake the engine shakes... took it to a mechanic who said it was the rotors so i had them and the brakes repalced but the car is still having the...

Do you have a service light on or check engine.If the car shakes when it is not moving it is not the brakes.I would guess an engine misfire or poor engine preformance if it does it while idling.An 11 year old Volvo is probaly ready for some new plug wires and spark plugs if it has not already been done.Good Luck!

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I had a problem with starts on my 98 sc2, did it twice only, but it would start up, shake a bit then shut down like it wasn't getting fuel, or a wrong mixture. Replaced the coolant temperature sensor and starts / idles like new now... goodluck

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RPM still a lil high after engine swap

With an idle control problem like this, you need to check for codes. One possibility is a code 14 Electronic Air Control Valve failure. Remove the connector at the valve and measure the resistance at the valve terminals. If the resistance is not 8-15 ohms, replace the EACV. Another problem could be with codes 1, 41, or 43, which pertain to the O2 sensor, which could have been affected by running the engine with no exhaust system. Try resetting the codes by removing the back up (Clock) fuse in the relay box under the hood for ten seconds. One more thing to check is for code 10 Air Temperature Sensor (TA). Resistance across the TA terminals should measure from 1000 to 4000 ohms.

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