Question about 1998 Chevrolet Tahoe

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I replaced the intake manifold gaskets on my 7.4l vortec. Replaced everything where it goes. Double checked the plug wiring ( all correct). The fuel pump comes on, the engines turns over but will not start. any ideas?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

gabndan2
  • 35 Answers

SOURCE: How to install intake manifold gaskets and their location.

go to autozone.com and register free then select make year ect.
select repair info (you have to register 4 this)
step by step and photos!!!!

Posted on May 31, 2009

  • 599 Answers

SOURCE: Service Engine Soon Light and Rough Idle (Below 1200 rpms)

do you get check engine codes?..have you done a leak down test and compression test to determine mechanical engine health?

Posted on Oct 07, 2008

psds4
  • 293 Answers

SOURCE: 1998 GMC Jimmy Vortec V6 4.3L 4WD

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800bfc68
hope this helps

Posted on Oct 17, 2008

  • 1 Answer

SOURCE: 95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

Posted on Dec 10, 2008

  • 43 Answers

SOURCE: service engine soon light on 2002 chevrolet tahoe stays on

That normally means that you have a issue with your gas cap try replacing your gas cap first then diconnect the negative terminal of the battery for about three minutes to clear the memory and start the truck again

Posted on Apr 11, 2009

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I have a 2001 chevy blazer 4.3 vortec engine and I'm lost I don't no what else to do, my check engine light is on and I'm getting the code p0171 and p0174,


Codes indicate engine is running lean (bank 1 and bank 2). This is usually an indication of a vacuum leak - usually sizeable. Check to ensure that you have reconnected all vacuum lines, especially the power brake booster. The next suspect if all vacuum lines are properly connected is the intake manifold. As you have just replaced the gasket, you may want to double check that all fasteners are in and properly torqued.

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If you replaced the plug, wire and cap then it's either gona be the intake gasket seeping or a bad valve. Gasket more than likely I'd say bc the vortec motors are really bad about leaking or blowing the lower intake gaskets

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The squeel is probably a belt slipping.. means you need to tighten the belt.. The poor running.. To replace head gaskets you must remove everything on the top of the engine. I would look at everything i disconnected and make sure it is properly connected and all hoses and wires are in the right place. check your spark plug wires to make sure they are connected to the correct plugs. Spark plug wires best possibilty. Look for Vacuum leaks another good possibilty. Something you did is causing this problem check everything two more times. Check for loose ground wires for the fuel injectors. A good suggestion is to take pictures of the engine and all connectors and hoses before you dissemble. Then you can check the pics for reassembley. I always take the pics on every job i do.

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double check all your wiring to the coil make sure all thre plugs are pluged in corrrectly

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Go to You Tube Video to find the problems
with that motor & the solution
A local repair shop can check bulletins in their
data base for the fix also
Most likely intake gasket,if you use Dex Cool
It eats gaskets & the vehicle is old ,so you can expect
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The website has software that looks for obscene words.
I would think a compression test would show if the cylinder is having mechanical problems. And yes the intake or head gasket could be leaking again, especially if the intake or head were warped or cracked.
Have you checked fuel pressure ?
Does the spark plug for cylinder 5 show signs of coolant leaking into the cylinder ?

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Check for fuel presser bleed down, does the fuel presser hold after you shut it off? or does it fall off? if so check for bad pulsar valve or bad injector ect.

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Most likely the intake gaskets are bad. they will sag in the middle over time and allow a vacuum leak between the head and intake. recommend replacing the gaskets with the steel instead of plastic ones.

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1 Answer

Cylinder #2 Misfire-after intake manifold replaced


It's possible he has two plug wires crossed, or pulled a spak plug wire apart replace #2 spark plug wire First. To test check the firing order and make sure all the wires on the right plugs and the correct place on the distributor, if it is right, then buy a can of carburator cleaner and spray around the intake gasket if the engine revs up when you spray the carb cleaner around the intake manifold with (engine running) if the engine rpm revs up you have an intake leak.

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