Question about 2001 Volkswagen Passat

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Very smokey when started from cold

Very smokey and missing when cold .i did glow plugs x4. and did injectors

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  • yadayada
    yadayada May 11, 2010

    What about the pump?

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  • Volkswagen Master
  • 2,359 Answers

If it's the org. engine it will has over 90,000 miles on it.

When was your last valve adjustment?

Timing belt is due if it's over 120,000 miles. Incorrect timing will cause late timing.

Can your shop do a compression test?

It's normal to has the valve stem seal/oil seal on the head to leak oil into the cyclinder.
The smoke you see is the motor oil drop from the seals. It land on the top of the cyclinders and it create black smoke at start up.

The inexpensive fix is to start using high mileage oil with seal conditioner.

This will help soften the rubber seals and help reduce internal oil leak.

The correct fix is to wait until it's time for a head gasket replacement and let the professional service the head.

Complete head service is the only method to stop this internal oil drip problem.

Posted on Aug 24, 2009

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6.0 2004 F-250 was starting hard when cold, replaced glow plugs &harness still starts hard runs rough, glow plug light stays on longer now though


time for replacement of or severe cleaning with fuelinjection cleaner..also if diesel, add cold start to the fuel system..check and replace oil filter type fuel filter since jelling of fuel may be a cold start issue..crack open an injector line and see if injector pump is pushing fuel really well..and see if air cleaner needs replaced blackened element is not good..good luck..

Jan 19, 2013 | 2004 Ford F250

1 Answer

Just on cold start up the engine runs lumpy for about one minute, then the rest of the time it runs fine.


Make sure the block heater is working. But with high altitude and cold air this is somewhat normal for a diesel on cold start. If the glow plug indicator light flashes off and on quickly in the dash you may also have a burned out glow plug(s), this also causes a poor cold start.

Oct 18, 2012 | 2002 Volkswagen Jetta TDI

1 Answer

The injectors has no wires going to them they are mechanical injectors


Hi, they are engine timed injectors, and yes they work from injector pump pressure, as for the cold start there will probably be separate glow plugs which will have either a wire or a buz bar connecting them all with a common feed. Hope that helps

Oct 18, 2012 | Cars & Trucks

1 Answer

My rexton 2005 wount star when its cold changed glow plug relay stil the same . and no glow plug light on the dash bord thanks


Two part answer, firstly the glow plug light. The glow plug light on a Ssangyong will only illuminate if the ambient temperature is low enough for the glow plugs to require heating. I did not believe it when I first heard this but sure enough, on the first frosty morning I had the truck, the glow plug light came on for a few seconds. Don't worry about it, the temperature needs to be really cold before it will come on.
Secondly the no-start issue, I had a similar problem with my Ssangyong Rexton. Unfortunately, it is the injector pump, the filter gets clogged with micro-particles of crud. Take it to a diesel pump specialist (as a Ssangyong dealer won't know what to do in my experience and they will charge $000's to fix) and get them to remove and clean the injector pump.

Sep 09, 2012 | 2005 SsangYong Rexton

1 Answer

Glow plugs might be on when starter is not engaged. wont cold start. have new g plugs no fuel leaks


That is a self priming system on the 6.0 diesel. It has an electric fuel pump check to see if you have fuel getting to the filter up on top of the engine. If you crank the engine and immediately loosen the upper filter housing or crank the engine over with the cap loose it should spray fuel. If you have fuel spray up on top than you most likely have a computer or injector problem. I did have a 6.0 once that would not start because of a shorted out fuel injector. Also check your engine oil level the injectors in that engine are operated by oil pressure. No oil no start.

DO NOT USE STARTING FLUID of any kind on that engine or any engine with glow plugs. Severe engine damage can and will result from use of starting fluids in diesels with glow plugs or heating grids.

The only exception is if you disable the glow plugs or heating grid before using a starting fluid and even then you need to be certain that you know what you are doing

Feb 28, 2011 | 1988 Ford F 250

3 Answers

Will not start in cold weather. Starts great if temperature is above 20 degrees. New battery and no problem found by mechanic.


There is a 5th injector called the cold start injector, that is electrically controlled off the starter. You can easily unscrew it while still attached to hoses and wires, and watch it squirt. You can also verify it is getting voltage with a test light or meter. There is also a thermal timer for it that could be bad and preventing current from the starter.

Jan 03, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

2000 peugeot 306 1.9 diesel smokey on startup and misfiring when cold but is ok after heating up no wAater loss any ideas


change the glow plugs i used to have a 306 and a huge cloud of white smoke come out of the exhaust on start up lol, changed the glow plugs and was clear as a whistle, its because the glow plugs dont get as hot as the others and fires up on the hottest cylinders so if you have two glow plugs out the other two are being forced to turn over hope this helps you ;)

Nov 15, 2009 | 2005 Peugeot 405

1 Answer

Where can I find the schematics for a 1995 Ford F250 7 3 liter turbo diesel? We're able to start the truck on ether, but she won't continue to run. We're guessing it's the fuel pump, possibly the filter or...


drain water from filter. change filter. prime system.
If it doesn't fix it, check glow plugs to be sure they are preheating combustion chamber.

Fuel Supply System The fuel system consists of the following three major subsystems:
  • Fuel supply system
  • Injection control pressure system
  • Fuel injector assembly
The fuel transfer pump is a camshaft-driven, two-stage diaphragm/piston pump mounted in the engine "V".
Fuel is drawn from the fuel tank through the primary filter by the diaphragm section of the transfer pump. Pressurized fuel (approximately 28 kPa [ 4 psi]) is supplied to the secondary filter and returned to the second stage of the transfer pump. The piston-actuated second stage of the transfer pump supplies 276-345 kPa (40-50 psi) of fuel to the rear of each cylinder head where it flows to a fuel rail machined in each head.
Drillings in the cylinder head route the fuel to the plunger area of the fuel injector which can pressurize the fuel to 124,110 kPa (18,000 psi) for delivery to the combustion chamber via a conventional nozzle/valve tip arrangement.
Return fuel is plumbed from fittings at the front of each cylinder head to a junction block which contains a piston/spring type regulator valve that maintains pressure to approximately 414 kPa (60 psi). A de-aeration bleed orifice between the fuel filter and the regulator block vents air trapped in the fuel filter. Most of the fuel from the regulator is recirculated to the inlet of the piston (high pressure) stage of the transfer pump. Fuel return to the tank is limited to 30-38 liters (8-10 gallons) an hour through the use of a 0.0008mm (.020-inch) orifice. This prevents the fuel from overheating in the tank.
---------------------------------------
Injector Driver Module The injector driver module (IDM) is used in conjunction with the PCM to sequentially control power to the fuel injectors on the 7.3L DI turbo diesel engine. The PCM processor generates two digital control signals for the IDM: fuel delivery control signal (FDCS) and cylinder identification (CID). The FDCS signal is used by the IDM to control injection timing and injection duration. The CID provides synchronization to the engine's first and fifth injector (firing order). The IDM verifies that FDCS and CID occur at valid timing intervals. The IDM outputs an electronic feedback (EF) signal, to the PCM, which is a delayed mimic of the FDCS for verification. Selected diagnostic information is also passed to the PCM via the EF signal in run mode.
The IDM is a high-energy power supply which acts as an energy distributor to provide regulated injector energy and control to the unit fuel injectors, based on FDCS and CID commands from the PCM. All IDM components are solid state; there are no user serviceable parts or adjustments. The IDM internal power supply uses a DC-to-DC converter to boost the supply voltage (VBATT) up to 115V DC. This supply is required to overcome the initial impedance of the injectors, ensuring rapid turn on. There are two high side drivers, one for each bank (left and right cylinder bank), and eight low side drivers, one for each injector. One high and one low side must be turned on to energize an injector. Once synchronized with the PCM, the IDM will select the proper low side driver (enable) and control the corresponding high side driver to regulate the current to an injector.
Continuous and on-demand system diagnostic information is provided between the PCM processor and the IDM via the EF signal. During normal operation, the IDM can indicate to the PCM that an injector low side short to ground has been detected, or that the IDM has lost synchronization.
The IDM constantly performs self-diagnostics and also monitors the injector circuits for electrical faults. Any fault codes set are transmitted via the EF signal to the PCM during Key On/Engine Off On-Demand Self Test. If the PCM is unable to obtain diagnostic information from the IDM, DTC 1668 is set.
---------------------------------------------
Glow Plug Control Glow plugs are used to warm the cylinders to improve cold-engine starting. The PCM uses the engine oil temperature (EOT) sensor and barometric pressure (BARO) sensor to determine how long the glow plugs will be on. The PCM energizes the glow plugs longer if the engine is very cold or if the barometric pressure is low at high altitudes.
The PCM controls the relay that supplies power to the glow plugs with the glow plug control (GPC) signal. When the GPC signal is grounded by the PCM the relay closes, turning the glow plugs on.
The glow plugs are controlled by the following sequence:
  1. PCM energizes the glow plugs.
  1. The PCM energizes the glow plugs immediately after the ignition is placed in the ON position.
  1. The PCM then determines how long glow plugs will be on based on EOT sensor and the BARO sensor. The required time to warm up the cylinder decreases the engine oil temperature and barometric pressure increases at low altitudes.
  2. ------------------------------------------------------
Glow Plug Lamp Control The glow plug lamp (GPL) signal controls the WAIT TO START light located on the instrument panel. This light is used to indicate when to start the engine. The cylinders are being warmed by the glow plugs during and after this light is lit. The PCM energizes the glow plug lamp longer if the engine is very cold or if the barometric pressure is low.
When the GPL signal is brought low, the "Wait to Start" lamp is turned on.
The glow plug lamp is controlled by the following sequence:
  1. PCM lights the WAIT TO START light after a key on reset occurs.
The PCM determines the glow plug lamp activation time based on engine oil temperature, barometric pressure and battery voltage.
  1. PCM turns off the WAIT TO START light.
The glow plug lamp is turned off when the timer counts to the number of seconds specified by the PCM. The glow plugs will normally remain on longer than the "Wait to Start" lamp.

Sep 22, 2009 | 1995 Ford F250

2 Answers

My toyota land cruser is poor to start first thing espesialy when its cold , I have replaced the glow plugs and fuel fillter


didyou replace the manifold heater?
have you checked the relay?have you checked to see if there is actualy power getting to the glow plugs? and also the fuse .
It is very srtange ,if the glow plugs are working ,for it not to fire up straightaway .Does it miss when it does first start?If so, the glow plugs are not all working.Last thing try giving it a squirt of aero start, or starter fluid , if with that ,if it doesn`t start straight away, then you better come back to me as i have another idea what could be a problem but I dont think the glow plugs are working properly so try the aero start first "youdoit"

Sep 13, 2009 | 2000 Toyota Land Cruiser

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