Question about JET Performance 1999 Pontiac Grand Am Mass Air Flow Sensor

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Check engine light stays on and i've had oxygen sensor, knock sensor, gasket filters,

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You need to have codes pulled and go from there... or you can waste a load of money by replacing every sensor on it

Posted on Dec 28, 2013

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2 Answers

Toyota Vitz 2007, 1.0 L, check engine light comes on at 100 km/h and goes off after turning off engine but comes back again at high acceleration like 100 km/h. change oxygen sensor as well.


That code is actually due to the fuel pressure being too low and causing a lean condition that the oxygen sensor picks up. It is common in that vehicle. Check the fuel pump pressure, filters etc.

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Check engine light stays how to get it out


You must clear the code . It can be cleared with an OBD2 code reader and some vehicles will clear by leaving the battery cable off for a while.

Dec 28, 2013 | JET Performance 1999 Pontiac Grand Am Mass...

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Check engine light on but no codes


The check engine light will come on when the ECM detects knock, it will only stay on if excessive knock is detected. I would replace the fuel filter and check your fuel pressure.
Could also be a bad knock sensor as the ECM will also advance the timing to make the engine knock. If on knock is detected when the ECM is doing this it will light the check engine light.

Apr 18, 2017 | 1987 Chevrolet Suburban

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The 2.5 has variable valves, check the intake valve control solenoids. There should be 2, one for each bank.

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1 Answer

What is code 325


P0325 - Knock Sensor Circuit Malfunction
Possible causes- Faulty knock sensor
- Knock sensor circuit short to ground
- Knock sensor circuit short to power
- Knock sensor circuit open
- Faulty Engine Control Module (very unlikely).
P0139 - O2 Sensor Circuit Slow Response Bank 1 Sensor 2

Possible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

Sep 27, 2012 | 2000 Mercury Villager

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2004 F150 5.8 Triton has a hesitation problem and slight backfire. We are in Belize where gas is not always filtered as in the states. We've changed the fuel filter 3 times in the last year but still...


That sounds to me like a bad oxygen sensor and/or a bad throttle position sensor. Is the "Check engine" light on? If it is, have someone check the problem codes. Either one of these will show up as a code. Either of these sensors can cause the fuel mixture to be too lean. A lean mixture can cause both of these problem. If the backfire is in the engine and not the muffler, that us almost always caused by a lean mixture. Since the fuel filter has not helped, I doubt that is the problem. If the engine has a spark knock on acceleration or hard pull, the fuel could be to low octane. If the knock is happening, you can get octane boosters to add to the tank of gas. Good luck.

Gaker

Aug 15, 2011 | 2004 Ford F150

2 Answers

Check engine light was on. Connected scan tool, got data below and cleared faults. drove car 5 miles, check engine stayed off. p0300 random multiple misfire detected p0325 knock sensor 1 circuit...


If the check engine light stayed off then that means that those errors are not present at this time. It is not un common to have intermittent faults but I would not preced any further until the light comes back on. Then re-scan the code see which are to begin diagnostics.

Mar 25, 2011 | 1997 Cadillac DeVille

1 Answer

I have replaced all 4 ox senors before I replaced intake man. gaskets. It is a 97 chevy W/Truck with a V6 auto, auto trans. 2WD. now service engine soon light came on after about 200 miles, it will go off...


First did you clear all the fault codes after your repairs? The reason I ask is po131 is bank one oxygen sensor, po174 is engine lean from faulty oxygen sensor, and po171 is engine lean condition, possibly from vacuum leak (intake manifold gasket?), pcv valve,etc. To check for vacuum leak at intake, start engine and gently spray starting fluid around intake gasket. If rpm raise slightly while doing this then there is a vacuum leak(stay away from air filter intake and housing though), and the gasket will need to be replaced again.

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1 Answer

Check Engine Light?


there are 3 one on each side of eng. on the Y pipe one behind the cat. convertor. not to hard change

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2001 toyota corolla check engine light is on. Code reads P420 low threshold. Changed front and rear Oxygen sensors reset the light and drove the car 50 miles and the light came back on. the car will not...


Mass Air Flow sensor! Just remove your air filter cover. Go to Auto Zone and purchase some solvent. Spray past the air filter and it should correct the problem. If not, replace the Mass air-flow sensor. This is commonly mistaken for an oxygen sensor. Mine did this and I followed these steps and it fixed the light. BTW, the light stayed on for 5 years before I fixed it. Never hurt anything. It's normally something to do with emissions. Dummy lights. :)

Aug 06, 2008 | 2000 Toyota Corolla

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