Tip & How-To about Chevrolet Lumina

New style intake gaskets for gm 3.1 and 3.4 ltr

These two engines along with the 5.0 and 5.7 and 4.3 have had a intake gasket problem for a long time,they usually needed to be replaced every 60,000 miles religiuosly because of a coolant and/or oil leak.well finally fel-pro fixed the problem,the old gaskets were made of plastic with rubber seals attatched to them and they were just like the factory gaskets,the new gaskets are made of metal with rubber attatched and they do not fall apart like the old style,so once you replace them with the "new" style gaskets you shouldnt have to do it ever again,and that should give anyone with these engines under there hoods something to be happy about since the repair bill to have them replaced is about 500-600 on average

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Why does my 2.5 GMC sonoma truck skips or misses?


Worn timing belt or bad map sensor, weak ignition coil, worn distributor gear (usually starts hard with that) Leaking manifold gaskets all possible causes. Start with a new coil, spray starting fluid around manifold gasket while running, if it revs up in any certain spots, manifold leaking (intake only test), check vacuum lines for cracks and leaks,(MAP) replace sensor. Over 75,000 miles probably timing belt, recommended change interval is 60,000 miles.

Jul 20, 2014 | 1990 GMC C1500

1 Answer

my 2006 pontiacgrand prix is leaking coolant right above the water pump. There is an L shaped pipe that seems to be where the leak is coming from. Does anyone know what this piece is and how hard it is to fix?


This was a common issue with these engines. Unfortunately there is no easy way to fix this problem other than to remove the intake manifold and replace this plastic tube along with the intake manifold gasket itself, these engines were common for the intake manifold gaskets leaking and also for that tube to crack over time and start to leak as well.

Like i stated, unfortunately there is no real "easy" fix for your problem. I have replaced many of these tubes and many intake manifold gaskets on these engines. I would not recommend doing it yourself unless you are familiar with these engine, there are special torque specifications for all the bolts. I do know that the intake manifold repair job usually runs somewhere in the ballpark of $800 - $1000 or more depending on where you take it.

Hope this helps...

Sep 14, 2011 | Pontiac Grand Prix Cars & Trucks

1 Answer

codes 171 and 174


This is a code for a lean condition. If you have a 3.8L engine there is a TSB 04174 about the engine Intake manifold gasket failing over time. This particular intake has a 2 piece contruction and uses a gasket between the 2 halfs.

You can also check for a dirty MAF sensor in the Air intake. Use Electronics cleaner to spray it and try driving afterwards. Another potential part is the DPFE which is attached to the EGR valve. In engines with more than 60,000 miles they are known for problems.

With the engine running, use a small amount of choke cleaner along the seams of the intake and where vacuum lines connect. If the engine RPM changes while this test is done, you have found a leak. Then repair the leak.

As with any repairs, once you have a "Check Engine" problem, when you repair something you need to erase the onboard computer with a scanner or by disconnecting the NEG cable of the battery for 10 minutes. Otherwise you will receive "check engine" signals for 25-35 Startups and will not know you have fixed your van.

I hope my solution is very helpful to you and you can use the reply feature of this service at a later time.

Jan 16, 2011 | 2000 Ford Windstar

1 Answer

80s cruiser L/H side of my engine it looks like diesel leaking


i am willing to bet it is coolant. over time you have to change your intake gaskets. because they will start to leak. now on the newer chevys this is very common to have to replace the intake gaskets every 60,000-100,000 miles. now if the cruser runs very good becides the leak i would definently replace the gasket and keep on driving the old girl. i hope this information was usefull to you and please rate my solution.
Thank you

Apr 21, 2009 | 1992 Toyota Land Cruiser

4 Answers

knock sensor location


The knock Sensors are located under the Intake Manifold at the top of your engine. The top will have to be taken off along with the intake manifold. Knock Sensors in past silverados used to have a problem with leaking water that corroded the sensors from washing the engine. Most times when you go to replace the knock sensor you will have to replace both along with the wiring harness that includes the the gaskets the knock sensors are surrounded by. After that you have to check the resistance to make sure you dont have any problems and then reinstall all parts along with a new intake manifold gasket. A good mechanic can do this for you in a day and charge you around $400. If you try to go to some place like a chevy dealer you will pay over $800. This is from experience of just replacing mine 2 weeks ago.

Dec 23, 2008 | 2004 Chevrolet Silverado

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