Question about GMC Yukon XL

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Have new sparkplugs,fuelpump but still takes long time to start engine, whats wrong

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What year is your Yukon ? What engine does it have , 4.3 l vortec ? With Central Port Injection system . Could have bad fuel pressure regulator . Hard start common problem with this fuel injection system ! GM CPI Leak Part 1 bleed down testing

Posted on Apr 17, 2015

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  • Master
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If fuel pump is new you should have good pressure before injectors, but check pressure anyway. If pressure is low go back and check for a bad fuel filter between tank and engine and replace. Fuel lines get clogged because of moisture in the lines causing rust. Did you replace the under pump fuel filter? Back to front, if pressure is good , injectors may be the problem. Do a compression test to see if your engine is starting to die. I have only given you an idea of what to look for. You will either have to check yourself ,or have your truck checked by a shop. GOOD LUCK FREIND.

Posted on Apr 17, 2015

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How do I fix this starting problem?


first buy a new sparkplugs replace the old and start the engine.
second check ignition coil if it produces spark , you can buy a cheap ignition coil tester at ebay.
third check your fuel injectors maybe they are dirty. fast solution buy a fuel injector cleaner that is added to the fuel tank.
hope this can solve your problem

Apr 30, 2014 | 2005 Chevrolet Impala

1 Answer

Car moves about 2 kilometeres and then engine will stop running. But after waiting for some few minutes you turn the engine on and it responds.


If you have a "check engine" light on, take it to Autozone, Advance, or Oreilys for a free scan.

One thing to try is borrow a fuel pressure test gauge from the above 3 places and when the car stalls turn the engine off, open the hood, and put the gauge on the fuelrail test port. You should have pressure.

If you do not have pressure, then either the fuelpump is getting hot or the fuelpump relay is shutting down.

If you do have fuel pressure, pull a sparkplug wire and see if the engine has spark by shorting the wire to a ground and have someone crank the engine.

Nov 11, 2012 | 2003 Kia Rio

1 Answer

I have a 1987 Ford Tempo. The car has a hard time starting. When I get it start it won't Idle. You have to hold the gas pedal down and even then the car wants to surge. What do you think the problem...


This may be as simple as a bad idle air control valve which controls the idle , it may also be a weak fuelpump, i would first have the fuel pressure tested to make sure its good, then i would clean the throtlebody with cleaner and replace the idle air valve. the engine it must not be skipping due to a sparkplug or sparkplug wire, there are many things that will cause this. you will neeed to do some checking and make sure the engine is operating good, is you have a bad idle air control valve you should be able to hold the gas pedal a little and keep the engine running after a few minutes the engine should run okay with you holding the pedal , keep in mind this is a 1987 tempo i dont know how many miles are it or if the engine is in need of work but if this is whats happening then try cleaning the throtle and replacing the iac valve. good day.

Sep 24, 2011 | Ford Tempo Cars & Trucks

1 Answer

Car will turn over but will not start


You will need to pin point the problem , by finding out what is lacking fuel or spark, try spraying starting fluid into the throtlebody and see if the engine starts but will cut back off once the spray is bruned up, but if it starts for a few seconds then you will know its a fuel problem,if it runs then you may have a bad fuelpump, the pump is located inside the fuel tank.if it doesnt then check for spark at the sparkplugs, to do this you will pull a sparkplug wire from a sparkplug insert a screwdriver into the boot of the wire you pulled off and place it near a metal part nearby and have someone spin the engine as you watch for it to spark, this will tell you if it has spark or not, also remove the dist cap and spin the key again and see if it sparks inside the dist,and also watch and see if the rotor in the distributor turns, the turning rotor tells if the timing belt broke if it doesnt spin while trying to start the engine, if the rotor is turning and theres no spark then you may have a bad distributor.do these tests and let me know the results and i can help you more, good day.

Mar 27, 2011 | 1993 Toyota Camry V6

1 Answer

Im not getting gas to the head anymore


Aveo, the first thing i would do is to make sure the timing belt didnt break or jump, these cars are famous for that. you will need to remove the upper timing belt cover and take a look.if the belt is good then check the fuses first, you are not getting fuel to head. maybe a bad fuelpump, did you check and see if its getting spark to the sparkplugs. if theres spark and still no fuel then i would look at the pump, test and see if theres power going to the fuel pump when the engine is cranking, start with these tests. good luck.

Mar 10, 2011 | 2006 Chevrolet Aveo

2 Answers

I have a 1993 Corsica, its been dying on me and not wanting to start, the engine light has been on too. So I put in a new crank sensor,fuel filter,fuelpump, and now a ECC(engine control computer) aka the...


Stop by any good auto parts store like Autozone, Advance, etc.. and have them do a free OBII scan for you to read all the fault codes. I'm only guessing after reading what you replaced you might need to replace O2 sensor(s) but instead of throwing parts at it, get the fault codes and go from there.

Feb 24, 2011 | Chevrolet Corsica Cars & Trucks

2 Answers

Sunfire just quit running while driving down the road


You will need to find out what is not happening , the engine has lost spark or fuel, so the first thing is to try some starting fluid and see if it fires up for a few seconds, if it does then we know its a fuel problem and may be a bad fuelpump, if it doesnt start then we must test for spark, not sure what engine you have but you will need to get to a sparkplug wire and place near the metal ground and spin engine and see if it sparks this will tell if theres spark.

Dec 24, 2010 | 2002 Pontiac Sunfire

1 Answer

04 chevy avalanche , takes 2 times the rotations of starter to turn the engine over but still starts .. Changed plugs and wires and tips maybe fuel pump injectors?


You are on the right track, the problem which is common is the fuelpump, the problem is , theres an internal antiflow valve the goes bad inside the pump, what happens is the fuel runs back into the tank and empties the lines and injector rail, when you go to start the truck it now take time for it to pnump fuel back through the lines to fuel rail and injectors and pressurize, so it take so cranking to get going. a little neat trick to be sure is to turn key on then off three times and then it should fire up, if it does then its the fuelpump, you will need to drop the tank and replace the fuelpump asm, the pump will still operate, we have customers that have had this problem for a couple of years and still havent repaired it due to the cost, they dont mind the long crank time to start, if you are going to repair drive until gas is about empty, this will help alot when its time to drop the tank,heres a picture of the fuelpump asm, hope this is helpful, have a good day.johnjohn2_13.jpg

Nov 08, 2010 | 2007 Chevrolet Avalanche LTZ

1 Answer

Has fire and is turning over strong but wont start


Probally not getting any gas. Turn your key to the start position and listen to see if you hear your fuelpump come on. It should be a humming noise for a few seconds then cut off by itself. If you hear that then your fuelpump shouldn't be your problem.You should have a valve pin on the fuelrail to the fuel injectors. Remove the small cap and depress the pin on the inside and see if gas squirts out. Do this after turning the switch to the start position. If gas squirts out then your fuel injectors are probally not spraying. Take out your #1 sparkplug according to your firing order which should be labeled somewhere under neath the hood and check it to see if it has any gas on it after a few times trying to crank it. If it doesn't then your fuel injectors are not spraying.

Oct 23, 2010 | 1986 Ford Ranger 2WD

1 Answer

I have a 2006 super duty f250 diesal.It cranks,but will not start.What do I need to do? I replaced both batteries with new ones.


Get a voltmeter or Test light and take off one of the Glowplug wires. The Glowplug is similar to a sparkplug and is not connected to the Fuel rail. You want to see if the Glowplug wire is getting power. The wire should have at least intermittent power, full power for a initial Cold start. This power lasts under 2 minutes.

Diesels need a Hot Glowplug to start the engine. All of the Glowplugs are connected to a timer box. The timer box is also Temperature controlled to stay on longer in the coldest weather. You should hear a "clinking" noise and the lights should dim in sync with the clicks.

If you are not getting spark to the Glowplugs check the connections to the timer box. If you are getting spark to the Glowplugs you may need to check them. Pull a few out and use jumper cables to briefly energize them. Watch out not to damage the threads. As you test do not overdo it. You can melt them!!

Finally, the fuel. Take off the fuel filter and observe if the fuel filter is empty or full. If empty you have a bleedoff problem in the fuel lines or a bad fuelpump.
Replace the filter with a new one and prime the filter with fuel. If the engine starts and then dies, you must find the bleedoff hole in the fuel line or check the output of the fuelpump with a gauge.

Diesels are harder to work on. I have read about crankshaft sensors causing problems. But for the most part, diesels are still primitive and the basictests have to be done by hand.

Jun 05, 2010 | 2005 Ford F 350 Super Duty

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