I have a 1990 gmc k1500 rich smell poor gas mile.


Asked by Apr 07, 2014 at 08:58 AM about the 1990 GMC Sierra 1500 K1500 4WD Standard Cab SB

Question type: Maintenance & Repair

I have a 1990 gmc k1500, I recently
changed out my intake manifold
gaskets and while doing thing I
cleaned all of the parts I had to take
off (ie: manifold, throttle body, ect).
After reassembling I found that one
of the I believe oil lines was heavily
clogged, so I cleaned the line. Now
when I drive after there is a think
smell of oil and gas and I believe it is
burning more gas then before hand. I
believe I put the distributor back in
correctly, any advice on what I could
do to fix this problem?

2 Answers


1.) The line you cleaned, was it the solid to soft one from the drivers side valve cover to the back of the throttle body to air cleaner spacer. Some oil in there is fine, as your engine wears out you get more blow-by past the pistons. The engine draws the waste gas in through this tube to be burnt, for emissions. 2.) Is it just the smells and lower fuel economy or did you notice a power loss? Your timing maybe out, how careful where you to get it back to exactly where it was before? 3.) What did you use to seal the valley, flat area on the block between the heads. The rubber pre-molded gaskets or the old school bead of RTV. Even with the pre-molded I use extra RTV where it meats the intake gasket on the head. You may be leaking oil vapor from this area check with a mirror.


I redid the intake manifold gaskets again and it was leaking again (looked like from where you put the distributor) so I took it out to take a look and readjust and when I put it back to see if I fixed the problem. Not when I go to start the car the starter starts to crank and then a pop happens with distributor. What could cause this?

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