Question about Jeep Wrangler

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The initial ignition of the day turned on quickly, but the ignition during the day it takes longer to start the engine.

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  • Jeep Master
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Are you also losing fuel economy? Is the vehicle still warmed up/hot when you are trying to start it again? How many miles have you driven since the last time the throttle body was cleaned? Does it also have a rough idle until it's warmed up?

My guess for now is that the electronic choke/IAC valve is gummed up and sticking. When a vehicle is cold, the valve is supposed to stay open until it is warmed up and the idle speed goes to normal as it reaches operating temperature at which time the valve will close. When the throttle body gets hot, the carbon build up and mixture of any oil that will get on the valve gets sticky so when it needs to open it is slow to do so. If you don't know what the electronic choke or IAC valve is for your Jeep, look it up on a parts website, find it on your vehicle, remove it and clean it with a throttle body cleaner and replace...make sure you don't lose any gaskets attached to it.

Posted on May 08, 2009

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1 Answer

2007 Toyota Tacoma v6. Hard to start about 1 hour after initial cold start, longer cranking. Problem?


Is the check engine light on? How long has it been since the engine was tuned up? A worn plug that is "hot soaked" can create a longer cranking time. Hot soaked means it may have some un-burned fuel in the cylinder since the first cold start. A weak or worn plug has a harder time getting this fuel burned out of the cylinder when more fuel is being added during a warm start.

Feb 23, 2015 | 2007 Toyota Tacoma Regular

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Where is the body control module located in 2002 gmc envoy?


It's under your back seat. See here for picture http://www.ebay.com/itm/like/261068608953?lpid=82
Here is the relearn procedure which you have to perform so the new BCM will recognize your key and start the car:
For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process. In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM. If this password matches the password stored in the PCM, the system enables fuel delivery. So you can see that if either the BCM or PCM are replaced, a relearn procedure is necessary. This same relearn procedure can be used if an ignition key with a different resistance value is used to replace the existing key. Before beginning the relearn, make sure there is a fully charged battery in the vehicle, and both the BCM and PCM are properly powered up and in communication with each other. Now you're ready to initiate the relearn procedure.

1. First, insert the ignition key and turn the ignition switchto the "On" position (Do not start the engine). Leave the switch on for 11 minutes. The security light may flash or be on steady during this 11 minute period. Make sure the light is no longer on or flashing before proceeding to #2 .
2. Turn the ignition switchoff for 30 seconds.
3. Turn the ignition switchto the "On" position (as in step #1) for 11 minutes again.
4. Turn the ignition switchoff for another 30 seconds.
5. Turn the ignition switchto the "On" position for 11 minutes a third time.
6. Turn the ignition switchoff for 30 seconds one final time.
7. Turn the ignition switchto the "On" position one final time and wait 30 seconds.
8. Attempt to start the engine. If the engine starts and runs normally, the relearn is complete. If the engine does not start, check for trouble codes and address them before attempting the relearn procedure again.
You can pick one oif these up for $20 or less at a junkyard. For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process. In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM. If this password matches the password stored in the PCM, the system enables fuel delivery. So you can see that if either the BCM or PCM are replaced, a relearn procedure is necessary. This same relearn procedure can be used if an ignition key with a different resistance value is used to replace the existing key. Before beginning the relearn, make sure there is a fully charged battery in the vehicle, and both the BCM and PCM are properly powered up and in communication with each other. Now you're ready to initiate the relearn procedure.

1. First, insert the ignition key and turn the ignition switchto the "On" position (Do not start the engine). Leave the switch on for 11 minutes. The security light may flash or be on steady during this 11 minute period. Make sure the light is no longer on or flashing before proceeding to #2 .
2. Turn the ignition switchoff for 30 seconds.
3. Turn the ignition switchto the "On" position (as in step #1) for 11 minutes again.
4. Turn the ignition switchoff for another 30 seconds.
5. Turn the ignition switchto the "On" position for 11 minutes a third time.
6. Turn the ignition switchoff for 30 seconds one final time.
7. Turn the ignition switchto the "On" position one final time and wait 30 seconds.
8. Attempt to start the engine. If the engine starts and runs normally, the relearn is complete. If the engine does not start, check for trouble codes and address them before attempting the relearn procedure again.

Dec 13, 2014 | 2002 GMC Envoy

1 Answer

Isuzu rodeo wont start


When you take your starter to Autozone,they will test for free.Then you will know before you buy one.

Sep 09, 2012 | 2003 Isuzu Rodeo

1 Answer

Resetting the passlock


1. First, insert the ignition key and turn the ignition switch to the "On" position (Do not start the engine). Leave the switch on for 11 minutes. The security light may flash or be on steady during this 11 minute period. Make sure the light is no longer on or flashing before proceeding to #2 .
2. Turn the ignition switch off for 30 seconds.
3. Turn the ignition switch to the "On" position (as in step #1) for 11 minutes again.
4. Turn the ignition switch off for another 30 seconds.
5. Turn the ignition switch to the "On" position for 11 minutes a third time.
6. Turn the ignition switch off for 30 seconds one final time.
7. Turn the ignition switch to the "On" position one final time and wait 30 seconds.
8. Attempt to start the engine. If the engine starts and runs normally, the relearn is complete. If the engine does not start, Go to this link for info
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Sep 08, 2012 | 2000 GMC Yukon Denali

1 Answer

2000 Dodge RAM 1500 Van, Hesitates and misfires after initial startup


try 0 timing carbon in your pistons can create similar problems,special wen engine is hot.

Aug 10, 2012 | Ford F-150 Cars & Trucks

1 Answer

Fuse and relay for the fuel pump


The fuel-pump relay unit is responsible for turning the fuel pump on when it detects the engine is running. When the ignition signal stops, the fuel-pump relay switches the pump off. Problems with the ignition and starting the vehicle often can be traced to the condition of the fuel-pump relay.

Description

  • The fuel-pump relay is a small unit, typically enclosed in a plastic case. The unit contains several sprockets on one side that are clipped onto the ignition system. The fuel-pump relay is engaged only during the start cycle. If it is faulty, it can take longer to start your vehicle.
  • Location
  • Most fuel-pump relay units are located under the dashboard near the steering column. In some cases, the unit is located in the area where the steering column is mounted or near the engine's firewall. The end of the fuel pump relay is typically located near the center of the floorboard, under the carpet in the front section of the passenger's or driver's side footwell.
  • Considerations
  • In addition to difficulty in starting the vehicle, symptoms of a poorly functioning fuel-pump relay include the following: the car dies then starts a few minutes later; the fuel pump makes a strange noise (humming or clicking loudly) for longer than five to 10 seconds after starting; or the engine won't start after you have engaged the fuel-pump switch.
  • Troubleshooting
  • When your car does not start properly, you can conduct a fuel-injection relay test. Two relays are located inside the fuel-injection system; one of them is responsible for turning the ignition on without turning over the engine, and the other is responsible for turning on when the engine turns.



    You can check to see if the first relay is working by touching it while turning the ignition on and off. You should feel a "click" every time you switch the ignition. If the fuel-pump relay is not working, you can "jump" the unit with a small lead jumper cable. You will need to access the fuse panel and insert the cable into the relay unit; the unit will run as long as the wire is inside the relay and can help start your car.
  • Jan 15, 2011 | Chevrolet Lumina Cars & Trucks

    2 Answers

    Now it just will not start. It's was taking longer and longer to start. I tested the starter and replaced it. Now after a few (5-10 turns of the key) it turns over but wont engage and actually start. Even...


    I would take the starter out and have it bench tested to verify if it has gone bad in the mean time.

    Check the battery for bad connections and also for a full charge.

    Check that the battery connections are clean and shiny and new looking when removed from the battery.

    How old is the battery? 3 years is a typical life of most batteries sold and installed in cars these days. If unsure, then try a new one from the store which is fully charged to test, or connect a battery charger to your existing battery to see if it will take a charge.

    Trickle charge your battery for up to 3 days to get a full charge on it.

    Good luck on this repair.

    Oct 29, 2010 | 1993 Subaru Legacy

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    LEXUS LS 2004 Maint Reqd (Master warning light) how I can switch off after change the oil engine?


    You can disconnect your battery for 15 minutes or pull the fuse for an ECM or PCM fuse, but the best way is to visit any local repair shop. Most shops will have a universal Check Engine Light Code Reader that can quickly and safely reset check engine light trouble codes. It should take about 30 seconds.

    Ask your local service center if they could reset the check engine light with a Check Engine Light Code Reader.

    Dec 14, 2009 | 2004 Lexus LS 430

    1 Answer

    No power to fuel pump, relay is good, engine cranks over but won't start.


    You need to follow a detailed troubleshooting procedure in a repair manual.
    Check for spark plug fire during cranking after it dies.
    No spark = ignition problem= computer will not fire injectors, and possibly cut out pump also.
    Good spark = pump wonky, or power to pump system.
    Also, other quick tests... when the thing dies, and then you crank,
    1) Thump the fuel pump in the tank, if you can. A bad fuel pump might start up again.
    2) Shoot some ether carb cleaner in the TB. If it only fires off the ether, the ignition system is no longer suspect.

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