1.3L '93 HCE Charade (Injected), just done the head after blowing a gasket, done about a 100km perfectly, now engine is surging at Idle, speed of surge approx every second by about 400rpm at idle. does this sound like fuel flow problems? or the computer trying to compensate for something else. Didnt do Fuel filter yet, but this problem happened suddenly, not a gradual thing. Timing is bang on, plugs look good..... the engine is starting to push water out of the overflow bottle again tho :( so either retension tehead and hope for the best or rip it off and go again, but not sure this would cause the surging problem??
My charade surges when the water level is low. So if you didn't skim your head before torquing it down, you might not have sealed it properly, and water may be seeping out. Or it might just be a faulty radiator cap
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The idle speed in your car is controlled by a computer (known as the PCM), the computer controls a valve called the Air Bypass Valve, this valve and the throttle valve get full of sludge from fuel vapors and combustion "blow back", this causes the valve to stick or move slowly, this in turn causes surging (speed goes up and down) in the idle speed of the engine, it is the most common reason for idle surge on any fuel injected gas engine up to about 2004 when car makers starting using electronic throttle control. To clean the idle speed control valve and the throttle valve do the following. To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professiona
The head has a cracked water jacket. The best thing to do is try finding a remaned head from the local salvage yard and take it to your local machine shop to make sure everything measures up and checks out
White smoke usually occurs when there is not enough heat to burn the
fuel. The unburned fuel particles go out the tailpipe and typically
produce a rich fuel smell. It's not unusual to see white smoke in the
exhaust during cold weather until the engine warms up.
Faulty glow plugs or control module can cause white smoke on engine start up.
Low engine cranking speed may also produce white smoke.
white smoke is still visible after the engine has warmed up, the engine
may have one or more bad injectors, retarded injection timing or a worn
Low compression or air in the fuel system can also be a source of white smoke.
the 2001 altima is what i have and I had the same problem as you. turned out to be a bad head gasket factory used cheap ones for a few years before they found the problem. one way to test this is to get a can of carborator cleaner and spray it around the area where the head meets the block under the intake problem should be around the 4th cylinder or close to driver side. if the head gasket is bad the rough idle will smooth out while you are spraying the head.
hi there i seems that you have replace alot of components after driving for a few days to let the ecm relearn with the new components . is it still missing at low speed ? seems you may have a spark plug thats not offering up its full potential please isolate what plug is the weak one by removing one spark plug wire from plug at a time to listen to the engine and see what plug is causing miss ok good luck you could replace all but this is an extra expense take a look