Hi.
If problem is only on startup and when idleing, then the problem is likely IAC system, also a vacuum leak will cause the same problem.
If problem is not only on startup and idle, but also when driving, then MAP sensor and EGR system must be checked.
Check also accelerator cable state and setting.
The first thing to do is pulling out the OBDII fault codes stored in the ECM. This is done connecting a code reader to the ECM diagnostic port. The job can be done for a small fee at any local garage, and it is done for free at AutoZone.
The codes will help locating the problem.
About possible faults:
Problem is stalling when idling and during startup, but engine idling fast all the time. Problem not starting at times it is due to the fact that the wrong mixture is being sprayed, this is probably causing flooding and misfire. Since the CEL is on, one of the codes returned is probably misfire.
Check accelerator.
Check IAC system. This is composed by a valve and a solenoid that check and control amount of extra air air when the engine is idling. The IAC valve is located on top of the throttle body.
Check the vacuum system and try cranking with gas tank cap off. Vacuum
system is tested using an hand tool gauge onvacuum lines while spraying
card cleaner on the hoses (or heating them with a torch). If there is a
leak, pressure will go up. A big leak will also do hissing noise, and
will often result in a lean code when doing an OBD code scanning.
This kind of symptoms can also be caused by weak wiring to MAP/MAF sensor (MAP in this engine).
If the car also drives very rough and is revving up and down in a weird way, check the EGR valve.
As first thing I would do a code scanning. This car is OBDII. The scan can be done for free at the nearest Autozone, or for a small fee at any garage.
If you get any OBDII code from the scan, report it here, so that we can individuate the possible reason for the problem.
If you repute my solution helpful, then please take some times to accept the solution. Providing good repair tips requires time and skills, and your feedback is important for us.
Regards.
Ginko.
Hi.
Apologies about the jargon. Here some explanation:
IAC system: Idle air control. This is a system that controls air amount to be mixed into the injection. It will affect the performance only when engine is revolutioning at low rounds per minutes (idle).
Vacuum leak: the engine uses a vacuum system to aspire air and gases. Vacuum system is used for different purposes. One is aspiring fuel gases and recicling them into the engine. This reduces consume and improves efficiency respect to old engines built before use of this technology.
MAP sensor :
Mass air pressure sensor. This sensor is used to find out how much air is getting into the air intake, and to determine the amount of air to be mixed with fuel and injected inside cylinders (fuel won't ignite if there is not enough or too much air).
EGR system : Engine gas recirculation system- This is composed by a valve (EGR Valve), with an electronically controlled solenoid. The valve opens and closes so that the right amount of recirculated gases from exhaust are being mixed again with air and fuel, to be used in the engine. Again a system to reduce consumes and improve performance. Gases get to the EGR valve through the vacuum system.
ECM (or ECU or PCM): main car computer, it controls most of the devices and systems listed above.
OBDII scan. Code scanning to find error codes stored in ECM. Each time the car computer detects a problem it will store a code in memory. An OBDII scanner is a device similar to a small computer. It is connected to the car through a port and a data cable.
About the repair.
As said the repair cost depends on the problem and on the time required to find the problem. Parts price will also concurr in determining final fee.
The purpose of my first post was helping you to insulate the probem before going to the garage.
If CEL is on (check engine light), then go to the nearest autozone, and do a free code scanning. Write codes on a piece of paper and come back to us.
Since problem is when engine is idle, then it is probably related either to IAC, or to vacuum. Air intake must also be checked for leaks, and the accelerator system must be checked.
Repair will be about two three hours in bill, but this depends on the mechanic. Unless the problem is determined already (eg: MAP sensor replacement, 1 hour), garage will need to charge testing time, and that may vary.
Parts price will also have influence on final cost of repair. MAP sensor for this model starts at $70. IAC valve is $50. A vacuum hose will start from $15, each connector or small part will add few dollars to the list. Let say that you should expect a repair starting from about $200, but that the cost may go up, unless the problem is well identified.
Best regards.
Ginko.
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thank you for the rapid response. Being a female i'm not sure what many of the acronymns mean that you used. Basically understand what you're saying, but it would be helpful if you could tell me what a MAP, etc. is...Also, can you give me a dollar range for what the costs might be to repair any of the items you mentioned so that I'll have a better idea. Knowing it needs to be repaired will coninuing to drive it a bit longer harm the engine?
Thanks
Thanks Ginko,
your explanations were great and easily understoon....at least have some idea of what I'm talking about when I take the car into the mechanics and what they tell me about the diagnostics...keep up the good work, people like me appreciate a quick tutorial or understanding a foreign language :-)
Ginko,
Your information about my Isuzu problem was right on....It is now running quite well and the repairs came in the neighborhood of what you had given me. I went to my mechanic armed with print outs of your information. Thank you so much. This was the best $18 I have ever spent!!!! I should get this type of return on all of my investments
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