Question about 1995 Pontiac Grand Am

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Engine knocks when accerlating and doesn't when you get going

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If I remember right there is a knock sensor that is suspose to keep that from happening. The computer recieves information from it and will make adjustments to prevent it. Check to see if the wire is still on it. If so, it may be bad. They are usually on the back side of the engine.

Posted on Jan 10, 2013

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Posted on Jan 02, 2017

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I have a 1999 Pontiac Sunfire. Transmission is going out I think. When I put it into reverse it's sometimes goes into reverse and sometimes doesn't but I hear a loud knock. fluid is right and not...


putting it into a gear and hearing a knock indicates that the engine mounts or transmission mounts are broken
naturally if you put it in neutral it will not move as that what neutral is
perhaps the neutral position needs adjusting as it may still be in drive
have the fault codes read to determine any sensor/servo/solenoid faults before spending big money on a transmission

Jun 29, 2017 | Cars & Trucks

1 Answer

Acceleration won't go past 3000 PRM at idle


The car does have a maf, but it is rarely the cause of rough idle. Rough idle is usually caused by vacuum leak, pvc issues, or idle air control valve. What does it do, specifically, and is the engine light on?

Jul 23, 2017 | 2005 Chrysler Pacifica

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My 2000 Windstar runs well for first 20-30 mins then it starts to have engine knock it is also using oil but not burning it. Doesn't smoke doesn't show any signs of leaks under car either


Check your engine coolant. If its brown you may have a blown head gasket which is causing it to leak into the cooling system. (expensive fix) but if it's not brown I'd take it to a mechanic and have further inspection. Hope this helps:)

Sep 20, 2012 | 2000 Ford Windstar

1 Answer

99 Suburban 4x4 knocking sound when shifting to highet gear when hot


If it sounds like a rapid tapping (like someone is using a small hammer to hit the engine block really fast) then you probably have spark knock. It happens to older engines. As the engine gets older, carbon builds up inside the combustion chamber and effectively increases the compression ratio. Since you are using low octane fuel, it doesn't resist spark knock as well as high octane (this is a reason performance cars use high octane) and thus you get spark knock. An easy way to tell for sure it to run a tank or two of 91 or better octane through. Since you'll be mixing it with 87 octane, it could take two fill-ups to see a result. If the knock goes away, then you know it is spark knock. If not, or the knock I described is not what you hear, then I would need a better description (perhaps a video) of the sound you hear. If it is spark knock, you can run a cleaner through (Sea Foam works great) the engine and that usually fixes spark knock. Sea Foam works best when given to the engine through a vacuum line. Don't add too much at once, it will hydro lock the engine. Just let it **** in a bit and when the idle comes back up, put a bit more in. I would pour half the can in the tank and feed the other half to the engine through the vacuum line. Be prepared, when you feed it to the engine through the vacuum line, it is going to smoke a lot until it burns off the Sea Foam. That is normal and will go away after a short drive.

Apr 08, 2012 | Cars & Trucks

1 Answer

I have a 2001 mercury cougar v-6 127000 miles that suddenly developed a tapping sound. It sounds like it is coming from the top of the engine. It is quiet at idle and increases with the rpms. I take very...


Probably a sticking valve lifter. Try putting a cup of transmission oil in the engine crank case, or any off the shelf product that is made for said problem. If it doesn't stop, you will have to get it looked at and repaired. It will eventually cause engine failure.
No, it isn't the knock sensor. The knock sensor causes the engine light to come on when there is a problem. It doesn't knock.

Feb 06, 2012 | 2001 Mercury Cougar

1 Answer

Have 1999 nissan maxima code #po325 an code#po400 ?dont know what is wrong with car, check engine light on?need help please


Technical Description

Knock Sensor Circuit Malfunction
What does that mean?

A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms

You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.
Causes

A code P0325 most likely means one or more of the following has happened:

Possible Solutions
  • Check the resistance of the knock sensor (compare it to factory specs)
  • Check for broken/frayed wires leading to the sensor
  • Replace the knock sensor

Sources: W. Farmer - Nissan


P0400 - Exhaust Gas Recirculation Flow Malfunction OBD-II Trouble Code Technical Description

Exhaust Gas Recirculation Flow Malfunction
What does that mean?

The exhaust gas recirculation (EGR) valve is vacuum controlled valve that regulates the amount of exhaust gases that re-enter the cylinders. The powertrain control module (PCM) determines how much based on engine load, temp, and other conditions. If the PCM detects that the amount of exhaust gases entering the cylinder were insufficient or non-existent, this code is set.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms

No symptoms will likely be noticed by the driver other than the MIL (malfunction indicator lamp). However, non visible symptoms will be increased combustion temperature and increased Nox emissions.
Causes

A code P0400 may mean that one or more of the following has happened:

  • Plugged EGR passage which restricts the flow of exhaust gasses
  • Faulty EGR solenoid
  • Faulty EGR solenoid wiring/harness
  • Vacuum lines damaged/disconnected to the EGR valve solenoid or to the EGR valve
  • Faulty EGR valve
Possible Solutions

Since EGR valve designs are different, no one test will suffice:

  • Using a scan tool, operate the EGR valve with the engine running. If the engine stumbles, the problem was likely intermittent wiring problem or intermittent blockage problem
  • If engine doesn't stumble, operate the EGR valve manually, if possible. If engine doesn't stumble and die, the ports are likely plugged. Removal of valve and cleaning of all ports will be required
  • Checking of solenoid can only usually be done with a scan tool, because most solenoids operate with a duty cycle of voltage, rather than constant voltage
  • Check all vacuum lines, hoses, etc for any damage
  • Visually inspect the solenoid harness and the solenoid for damage
  • Replace EGR valve

Dec 06, 2011 | Cars & Trucks

2 Answers

GMC 4.3L DTC P0330 flashing MIL


P0330 - Knock Sensor 2 Circuit Malfunction (Bank 2)
A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block. This P0330 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0325.

Symptoms: You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.

Causes: A code P0330 most likely means one or more of the following has happened:
The "B" knock sensor is faulty and needs to be replaced
There is a wiring short/fault in the knock sensor circuit

Possible Solutions:
Check the resistance of the knock sensor on bank 2 (compare it to factory specs)
Check for broken/frayed wires leading to the sensor
Replace the knock sensor on bank 2


Hope helps.

Aug 23, 2011 | GMC Safari Cars & Trucks

2 Answers

I have a 95 oldsmobile 98 regency elite I cant find where the knock sensor goes I have a haynes manual but where it shows it wont go


Well, for starters, your problem got posted under 1985 Oldsmobile 98 - then you said it was a 95 Oldsmobile 98 Regency Elite (HUGE difference between 85 and 95)...then it would be REALLY nice to know which engine we are talking about.

I'll just go with what you said last: 1995 Oldsmobile Regency Elite (Two engine possibilities)

If you have the 3.8L Supercharged engine (VIN CODE "1") it is on the left side of the engine near the oil filter.

If you have the non-supercharged 3.8L (VIN CODE "K") there are TWO of them. One is near the oil filter and the other one is in about the same location on the other side of the engine block.

Please also note that MOST fault codes for knock sensors are not caused by the knock sensors themselves. (they do fail, but it is very rare.) Usually there is either a wiring problem to the knock sensor, or the engine has internal problems causing a "knocking" or "ticking" noise which causes the engine computer to "think" that there is a problem with pre-detonation causing an "ignition ping". The code sets when the computer has retarded the ignition timing as far as it can and the "knock" or "ping" does not go away....usually it doesn't go away because it is not caused by ignition timing. The knock sensor is just doing its job and reporting the knock. It does not know the difference between a knock caused by ignition and a knock caused by internal engine problems.

Jun 28, 2011 | 1985 Oldsmobile 98

1 Answer

NOISE WHEN COLD THEN GOES AWAY WHEN WARMS UP,SOMEONE SAID MAIN BEARINGS GOING BAD


Hard to say over the internet but I will try to explain. If the noise is a distict KNOCK KNOCK and it sounds like it is coming from the bottom of the engine, then it most likely is a rod or main bearing. If it is a TAP TAP noise that sounds like it's coming from the top of the engine, then most likely a valve lifer is failing/failed.
the fact that it goes away when the car is warm, makes me lean towards a bad lifter. Normaly if a bearing is bad and knocking, the noise doesn't go away.

The KNOCK noise will be somewhat hollow sounding and the TAP TAP sound will be more solid. If the KNOCK KNOCK is solid, then a rod or main bearing has most likely failed to the point that a new/reman engine will be needed.

Jun 14, 2011 | 1994 Pontiac Grand Prix

1 Answer

Why does my car throw the code P0100 and P0325? I have a 1995 Nissan 240sx. and it has a random misfire once in a while.


Hi,

Often a single issue can trigger multiple diagnostics codes, especially if the circuits are closely related.

Code P0100 = Mass Air Flow (MAF) Circuit malfunction

The computer has detected an issue with the MAF sensor.

- Verify the MAF sensor wiring is connected and wiring is in good condition
- Unplug and reconnect the MAF harness
- Check that voltage to the MAF sensor is within factory spec


Code P0325 = Knock Sensor # 1 Circuit malfunction

A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block.

- Check condition of the knock sensor wiring.
- Test the 'Ohms' reading of your Knock Sensor (undo the connector and measure the pins) to ensure it is within spec (ask Nissan for this measurement). If out of spec, replace the knock sensor.

Cheers,


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Jun 08, 2011 | Nissan 240SX Cars & Trucks

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