Question about 1997 Nissan Pickup

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Rough idle and blue smoke. change exhaust manifold because it was cracks know its missing and sputtering when i put in gear. changed egr valve before manifold.

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johnny mcneely

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Blue smoke indicates either a bad transmission modulator valve,or a manifold leak{intake} i usually do this test for a bad or suspected bad intake manifold leak,light a cigarette and take it around the intake manifold and look for it to glow really bright for an intake leak,for an exhaust leak you can see it blow the embers away from it.just make sure there's no gas around to ignite.always make sure that a fire ext.is onsite! thank you for choosing fixya.com!

Posted on Jun 09, 2011

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No visable fluid leaks but, lots of smoke coming from tailpipe on cold start. The smoke stops when the engine is warm. Car runs smooth and no problems at all other than the smoke coming out of the...


If this condition happens first thing when you start the car, especially in cold temperature(s) climate, you have nothing to worry about; this is normal. It is simply water vapor- a normal combustion byproduct.

Here's what happens: the exhaust manifold is attached to the engine.

The exhaust manifold takes the exhaust from each cylinder and combines it into the manifold.

The exhaust gases then pass through the exhaust pipes to the various components of the after-treatment system which include the exhaust gas recirculation (EGR) system, catalytic converter and the muffler.

Before the gasses reach the catalytic converter however, they pass the oxygen sensor. The oxygen sensor tells the on-board computer what the composition of the gas is, and diverts some of this gas back into the engine via the exhaust recirculation system.

The recirculated exhaust helps keep some of the toxic gasses from entering the rest of the exhaust system.

The recirculated exhaust gasses also cool the engine cylinders, which in turn, decreases fuel consumption.

Depending on the year, make and model of the vehicle, the exhaust gas recirculation system may have an electronic EGR valve or a vacuum-operated valve. The electronic EGR valve has additional parts, including an EGR solenoid.

If the EGR system does fail, you may hear a ping and the vehicle won't pass emissions. If the EGR valve fails in the open position, the vehicle will not idle properly.

When the exhaust gases reach the catalytic converter, it reignites the gases that are not burnt in the combustion chamber so that they are not emitted into the atmosphere.

The catalytic converter creates a chemical reaction, burning the excess gasses and toxic by-products from the engine combustion process.

And in so doing, the catalytic converter changes carbon monoxide and hydrocarbons into water vapor and carbon dioxide (which is its main function.) And that is what you are seeing coming out of your car's tail-pipe!

Warmest regards.

Mar 11, 2014 | Mazda MX-5 Miata Cars & Trucks

1 Answer

Rough idle and blue smoke


Possible vacuum leak and or internal engine issue, have a cyl compression check done along with cyl leakage test

Nov 03, 2012 | Cars & Trucks

1 Answer

Found a crack in the exhaust manifold


transmission solenoid and misfire code unrelated
but need looking into
02 sensor should be fixed with replaced 02 sensor
egr code only if crack is close by


cast iron zorst manifolds
if the crack takes up when engine is running
not urgent
when ready source
a used manifold without a crack from a wrecker
cracks in cast iron zorst manifolds cant be welded
sucessfuly

or buy (extractors )metal exhaust manifold
if they crack... they can be welded

Mar 07, 2017 | Cars & Trucks

1 Answer

The computer is not allowing the egr solenoid to activate. vehicle sometimes run erratic and idles roughly. Code 41 comes up in addition to the codes 84 and 33 (related to egr.)


change your egr valve on the car and the problem should be rectified.
the egr valve exhaust gas recirculation valve send exhaust gase back to the inlet manifold to keep the air fuel fuel mixture at the right temp and the exhaust manifold from over pressurising.
if this fail seizes shut it stop the recirculation from happening yuo cant just clean them though they have to be replaced

May 27, 2010 | Ford Ranger Cars & Trucks

1 Answer

1985 Dodge Ram runs rough and stalls at idle.


There is a carb problem as you discribe it runs too rich and when it warms up some the engine can't handle all that extra fuel and stalls. Blows black smoke out the exhaust? do the exhaust manfolds leak at the cylinder head connection and or worse is the manifold cracked? The EGR valve sounds possible as the valve being partly open will make it do what you say. A thin peice of medal can be cut with sissors and put between the EGR and it's manifold and then tighten down will stop that leak. If it runs good then replace the EGR , or run it like that if you don't have to face a safty lane inspection. The PCV valve can do this too and or a hole or crack in it's hose. Remove it from the vale cover and let it hang in the end of the hose. If it runs OK now the oil has been gassed when you were having you carb trobles and as the oil heats up it fumes enoght to make the engine choke on the extra fumes of fuel. You don't nee to change the plugs if you don't want to but you should check them and maybe tourch them off with a propane tourch to clean off soot and other grime that comes from a motor thats not running right. Bet gas in the oil. Fuel pump can leak gas into the oil also. More oftem than you might think and still work.

May 11, 2010 | 1985 Dodge Ram 50

1 Answer

The car dies sometimes when idle and sometimes when traviling at


he EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on accelertaion.

Aug 21, 2009 | 1996 Dodge Grand Caravan

2 Answers

98 jeep grand cherokee diagnostic codes


change fuel filter. you have a lean conditions and vacuum leak in intake check all vacuum hoses and pvc valve.replace plugs and wires if they have not been change.if all is good get it scan egr valve cause rough idling and stalling.

May 15, 2009 | 1998 Jeep Grand Cherokee

1 Answer

Clicking noise when accelerating


It's hard to diagnose with just the small information you have stated, but it 'sounds' like it's that Exhaust Gas Recirculation Valve gasket.

In your cylinder head is a runner that brings exhaust gas up through the intake manifold.
The EGR valve is attached to the intake manifold, and the sensory part of the EGR valve sits down in the pathway of the runner.

A bad EGR valve gasket will let exhaust gasses escape, making the sound you described.

Apr 20, 2009 | Dodge Neon Cars & Trucks

1 Answer

Mirage Mitsubishi 2000 1.8L Rough Miss when Idle


Might want to look for vacuum leaks. Most misfires that go away with gas are caused by manifold vacuum leaks. The cat code can also be caused by the vac leak. There are different methods to find them and not real easy-but one way is to get a can of carb cleaner spray and spritz around intake areas. When the carb cleaner finds the leak--the car will run good for just and instant. Could be a rubber line or a manifold gasket. Hope it helped. Thanks

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