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2005 jaguar VDP 4.0L. Very hard start. Have replaced map and crank sensor, egr valve and intake.

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  • Jaguar Master
  • 3,187 Answers

In what way is it hard to start does the engine turn over fast or slow, fast is low compression in the piston chambers slow can be the battery or the starter motor wearing out. ( starter motor has bushes to turn the motor these wear out and cannot turn the engine over fast enough to start.

Posted on Aug 10, 2017

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Posted on Jan 02, 2017

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3mac
  • 61 Answers

SOURCE: 94 Automatic Geo Metro 3 Cyl. Map Sensor - EGR Valve

Unfortunately, both of these items are equally important and repairs can't normally be avoided by taking care of your car.

Your MAP (Mass Air Pressure) Sensor measures intake manifold vacuum pressure to help control the air and fuel mixture and timing. It contains a pressure-sensitive element that connects to an electronic circuit, generating a signal that changes with pressure changes in the manifold.

Your EGR (Exhaust Gas Recirculation) valve recirculates exhaust gases through the intake manifold to be burned again, cooling peak combustion temperature. Dilutes the air and fuel mixture to keep the nitrogen oxide emissions within breathable limits. And yes, it could very well be that the EGR solenoid that is causing the issue.

Both units effect your vehicle's fuel/air mixture. This is important because your vehicle running lean/rich can cause "snowball" problems. For example, a faulty EGR can cause the vehicle to run rich/lean. If not repaired, in time, the exhaust caused by the wrong rich/lean fuel mixture can damage the O2 sensors and/or catalytic converter.

If I had to pick, I'd start with your MAP Sensor. One guess I would have is that your MAP Sensor failed and made your vehicle start burning the wrong fuel/air mixture. Assuming I'm right, this could have damaged the EGR Valve. So, I see no reason to replace the EGR Valve alone, just so it too can be damaged by the poor fuel/air mixture caused by the still-faulty MAP Sensor. If your lucky, you may see the faulty EGR code disappear once your MAP Sensor is replaced.

Hope this helps and good luck!

Posted on Jan 12, 2009

jasperoni
  • 203 Answers

SOURCE: Manual for replacing a EGR valve.

This is a common problem with the 104 engine. I'm assuming it is a c 280. First you need to check a couple of things. Below your intake manifold there is a source vac. line running to a switchover valve located under the plastic cover on your front cam cover. that switch over valve operates your 2ndary air inj. and egr pipes. The codes you have are saying that these 2 systems are not operating. If the source is good take of the plastic cover on your valve cover(held in by 5mm. allen head bolts). the 2 vac lines running under that trough are running to your egr and your 2ndary inj. the 1st is the air inj. the rear one is your e.g.r. valve. If these systems just plain were not operating it would not cause your car to run poorly cold unless there was a vac. leak. Take a vac. pump and apply press. to your e.g.r. valve with engine running and you should notice a rough run when vac. is applied. The 2ndary air inj. is more complicated to test because there is more involved. Fixing this vac. leak will help get your adaptations under control and your vehicle will run a lot better

Posted on May 29, 2009

  • 145 Answers

SOURCE: CAM SENSOR ENGINE LIGHT. MAX RPM 2000 SOMTIMES

I seen this before first of all don't let the car dealer to BS the way to your money, most of the time is noting wrong whit the sensor it self but is the plug than goes in to the sensor this what i recommend is to buy another sensor from your local auto part store or salvage yard (cheaper) get three pieces of cable and solder directly in to the sensor brake the plastic around the sensor plug if necessary and secure the three cables to it put some silicon in between the solder and the place the new sensor on top of the old one so you now wish wire goes to which and cut and attach one by one. I now this works 100% i have done it my self many times if you need diagrams or sensor locations you can find that at www.alldatadiy.com now if you still have problems unplug all harness especially all the ones than comes from the back of the engine because that engine tends to leak oil on top of the harness if you have wires doing shortcut replace that section you can solder use heat string tube and change the insulation hose they sale those on part stores to put some zip tides on the ends and you will have your car back and will last Note don't let it get to close to the exhaust use zip tides to keep from touching hot areas.

Posted on Jun 10, 2009

  • 5520 Answers

SOURCE: egr problem

Check the passages under the airhorn. When carbon builds up the diagnostic blames the EGR for not opening and throws a code. Actually there is no flow to the EGR because the port is clogged and the diagnostic measures the flow after the EGR.

They really needed to have a sensor before and after the EGR. Also remember to disconnect the battery for 10 minutes to remove old info.

Posted on Sep 24, 2009

  • 1206 Answers

SOURCE: I have a 1992 Chevy C1500 2wd P/U with a 5.7 V8 in

check the iac valve for power if not the ecm is bad or the wiring to the iac valve could be broken in the harness.this is got to be an iac valve issue.

Posted on Jan 26, 2010

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Hi, I have a 2005 Jaguar VDP 4.2L. Very hard start. Have changed upper intake, Mass Air Sensor, Crank sensor, Fuel filter, some coils 3 & 5. Fuel pump is working. 180k miles


chek fuel pressure test then do a compression test on all cylinders should be at least 150- 175 psi the early engines suffered from prematually worn out nicosil coated cylinder bores but your engine is poss way after that but 1st thing comes to mind is low compression, good luck

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1998 chev.s-10 2.2 lt codes # 107...172..404..405 truck stalls at lights..jerks..won't take gas..pedal to floor...off and on problem...sometimes good for hours , than comes back


Hi, you may have 2 separate problems here. 107 indicates the MAP sensor, and that may be also causing the 172 code. The other codes indicate the EGR valve position sensor, which is integral to the valve itself. I would test both of these before replacing (the EGR valve is about $150 and the MAP sensor about $60-70). First check the connectors on them for any corrosion or poor connection. The MAP sensor is mounted to the top of the intake manifold. The EGR valve is at the back of the engine near the brake booster. Please let me know if you have any questions, and thanks for using FixYa.


MAP Sensor TESTING
See Figures 1, 2 and 3 jturcotte_1442.gif

Fig. Fig. 1: Typical Manifold Absolute Pressure (MAP) sensor wiring diagram (wire color, terminal identification/location may vary on certain models)

  1. Backprobe with a high impedance voltmeter at MAP sensor terminals A and C .
  2. With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
  3. If the voltage is not as specified, either the wiring to the MAP sensor or the VCM may be faulty. Correct any wiring or VCM faults before continuing test.
  4. Backprobe with the high impedance voltmeter at MAP sensor terminals B and A .
  5. Verify that the sensor voltage is approximately 0.5 volts with the engine not running (at sea level).
  6. Record MAP sensor voltage with the key ON and engine off.
  7. Start the vehicle.
  8. Verify that the sensor voltage is greater than 1.5 volts (above the recorded reading) at idle.
  9. Verify that the sensor voltage increases to approximately 4.5. volts (above the recorded reading) at Wide Open Throttle (WOT).
  10. If the sensor voltage is as specified, the sensor is functioning properly.
  11. If the sensor voltage is not as specified, check the sensor and the sensor vacuum source for a leak or a restriction. If no leaks or restrictions are found, the sensor may be defective and should be replaced.

jturcotte_397.jpg

Fig. Fig. 2: Using jumper wires and a high impedance voltmeter test between MAP sensor terminals A and C with the key ON and engine off. The voltage should be approximately 5 volts

jturcotte_398.jpg

Fig. Fig. 3: Next test between MAP sensor terminals A and B with the key ON and engine off. The voltage should be approximately 0.5 volts



EGR test: requires a GM scan tool:


jturcotte_1443.gif



EGR replacement:

Linear EGR Valve

  1. Disconnect the negative battery cable.

Note the position of the EGR valve prior to removal. Do not rotate the valve 180?.
  1. Unplug the valve electrical connection..
  2. Unfasten the valve retainers, then remove the valve and the gasket.

To install:

  1. Clean all gasket residue from the gasket mating surfaces.
  2. Install a new gasket and the valve.
  3. Install the valve retainers.
  4. On 1998-99 2.2L models, tighten the retainers to 19 ft. lbs. (26 Nm).
  5. Attach the valve electrical connections and connect the negative battery cable.

Component locations:

jturcotte_1444.gif

EGR valve wiring:


jturcotte_1445.gif
EGR valve pic;

jturcotte_401.jpg

MAP sensor pic:

jturcotte_400.jpg

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A P0401 code sets. I have done the egr valve three times on this car. I have cleaned the intake and the exhaust tube five times. The last time was only 1000 miles ago. The egr valves are new from the...



  • Restriction in the EGR passages, usually caused by carbon buildup
  • The EGR Valve is defective
  • Lack of proper vacuum or electrical signal to the EGR valve
  • Malfunctioning EGR Vacuum supply solenoid
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    • EGR Valve Position Sensor (EVP)
    • EGR Temperature Sensor


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    How hard is it for a shadetree mechanic to replace the manifold absolute pressure sensor on a 2000 4-cylinder Olds Alero? When I bought the part, it says it is an EGR vavle and I remember replacing those...


    The EGR valve and MAP sensor are indeed different and unrelated parts. An EGR valve that is stuck open can however cause the system to set a false MAP sensor code due to the loss of vacuum in the intake which will cause the sensor to read low but the engine should run very bad, if at all, when this happens. The MAP sensor is located slightly to the drivers side of the throttle body housing on the front side of the motor and is easy to replace. I'd make sure that your EGR valve isn't stuck open or that you don't have another large vacuum leak that could mimic a faulty MAP sensor before replacing it however. Hope this helps a bit and good luck!

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    2005 jeep liberty diesel code # p0101 map- sensor out of range what is map


    The MAP sensor (MANIFOLD ABSOLUTE PRESSURE) changes voltage or frequency as intake manifold pressure changes (air flow increases or decreases). The engine's computer uses the reading to advance or ****** engine timing. On older, non-fuel injected engines the vacuum advance on the distributor did basically the same thing.
    The MAP sensor also works with other sensors on the Jeep engine, specifically the Throttle Position Sensor (on the throttle body) and Crank Position Sensor (on the transmission bell housing) to control other fuel flow and ignition timing functions.
    If you're having problems with the MAP sensor, or are getting a Check Engine light and code for the MAP sensor keep in mind that other problems may cause that error code.
    Bad vacuum hoses, vacuum leaks, bad EGR valves, intake manifold leaks, clogged air filter can all affect the MAP. sensor. To know for sure all the other sensors should be checked for correct voltage and perimeters
    Also, if you have done any mods to the engine, especially intake, exhaust and ignition mods you may get an error code for the MAP or incorrect reading and a resulting loss in power or increased fuel usage.
    The map sensor is easy to change with a couple screws off the Throttle body.. The part the air inters (the air breather). Buy one from the auto parts store if your sure that is the problem and just replace it..There is no adjustments to it...

    It really sounds to me that you have a small vacuum leak in a line somewhere.You can try spraying the motor vacuum lines with soapy water with the vehicle running to find a leak. Also listen and feel under the dash for leaks and hissing sounds.
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    94 Automatic Geo Metro 3 Cyl. Map Sensor - EGR Valve


    Unfortunately, both of these items are equally important and repairs can't normally be avoided by taking care of your car.

    Your MAP (Mass Air Pressure) Sensor measures intake manifold vacuum pressure to help control the air and fuel mixture and timing. It contains a pressure-sensitive element that connects to an electronic circuit, generating a signal that changes with pressure changes in the manifold.

    Your EGR (Exhaust Gas Recirculation) valve recirculates exhaust gases through the intake manifold to be burned again, cooling peak combustion temperature. Dilutes the air and fuel mixture to keep the nitrogen oxide emissions within breathable limits. And yes, it could very well be that the EGR solenoid that is causing the issue.

    Both units effect your vehicle's fuel/air mixture. This is important because your vehicle running lean/rich can cause "snowball" problems. For example, a faulty EGR can cause the vehicle to run rich/lean. If not repaired, in time, the exhaust caused by the wrong rich/lean fuel mixture can damage the O2 sensors and/or catalytic converter.

    If I had to pick, I'd start with your MAP Sensor. One guess I would have is that your MAP Sensor failed and made your vehicle start burning the wrong fuel/air mixture. Assuming I'm right, this could have damaged the EGR Valve. So, I see no reason to replace the EGR Valve alone, just so it too can be damaged by the poor fuel/air mixture caused by the still-faulty MAP Sensor. If your lucky, you may see the faulty EGR code disappear once your MAP Sensor is replaced.

    Hope this helps and good luck!

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