20 Most Recent
- Page 3 Questions & Answers
Gasoline in crankcase
Very bad issue, and could be dangerous. Most likely cause bad fuel injector stuck open. This can ruin engine bearing so drain oil and replace while also fixing leaking injector.
1995 GMC Jimmy
on Jan 06, 2015
Why does it shake whenever i let off the gas and shakes real bad when i apply my brakes
If when applying the brakes the steering wheel shakes then your front rotors are warped and at the least need resurfaced and most likely the brake pads replaced. But more likely the rotors are too thin which has allowed them to overheat and warp which causes the shaking. In this case new rotors and pads are in order. If when braking tou feel the shaking in the seat of your pants then most likely the rear brakes are the issue. Same problem as the front, warpage, but your rear brakes are most likely drums. Again, possible resurfacing and new shoes; but more likely new drums and brake shoes.
But I wonder? Did this vibrating just start all of a sudden or maybe after a near accident requiring you to brake very heavily and possibly overheat the brakes. Or my main concern, to keep this from happening again, after pulling some type of trailer that you intend on pulling again. Pulling a trailer without its own brakes puts a much heavier load on your trucks brakes and just repairing them won't keep it from happening again if you ARE pulling a trailer. Higher quality rotors/pads/drums/ and brake shoes can help but if the trailer is too heavy for the truck nothing but installing brakes on the trailer or a lighter trailer will stop you from warping them again.
Lastly, in general when you let off the gas and the whole vehicle shakes the driveshaft/u-joints are common causes. Same with the steering wheel if it shakes when letting off the gas, but only on a 4x4 or AWD vehicle. So check your driveshafts and u-joints and make sure they are tight. But unless you find something obvious there I would wait until you have the brakes sorted out and see if that doesn't stop all the shaking.
1995 GMC Jimmy
on Dec 14, 2014
Bad idle on my 1995 GMC Jimmy. 4.3 Vortec CPI
Unfortunetly....these spider injectors and fuel pumps can have very similar symptoms when failing. What I do know is I work on this motor more than any other motor in my shop. Very common with fuel problems...and I can comfortably tell you that they updated the injector kits on these car for a reason. The original model is junk. I have done these on just about every one of my cutomers vehicles over 150,000 miles. However, I am not going to tell you that is your problem....but it sounds fuel related. Did/does your vehicle skip? Leaking injectors will usually cause a skip due to shortage of fuel to that cylinder. I also have a computer that allows me to monitor the firing of each cylinder, and do an injector kill test. This is what I would do first. Unfortunetly, sounds like you can't so start with this: Clean your throttle body. The pintle that the IAC motor pushes in and out goes into a small port. Spray that port out with carb clean. Get a fine wire brush and get that throttle body clean and shinny. That pintle can easily stick on existing carbon in that port...new part or not. Check for vacuum leaking with carb clean...spray it around the intake and vacuum hoses...see if any particular spot changes how it runs when you spray it. Do you have a vacuum gauge? what is manifold vacuum? Since you are in the intake...make sure your puddled fuel is not due to pulling the main lines off the the injector assembly. After intake is off. hook fuel lines and harnes back up to injector assembly. key up (no start) vehicle...this pressurizes fuel system. look for leaking. The fuel pressure regulator is built on to the side of that assembly....its the round diaphragm with the tube coming out of it. If it leaks fuel out...that may be your problem. And you can replace that without doing the whole injector kit...fairly cheap. If not fixed....what is your fuel pressure. You need to have 60-64 PSI at key up. Try the carbon build up and intake test first...both quick, easy, and cheap. If this is not your issues...its sounds fuel related....just want to confirm that you don have a misfire/skip. That could change diagnosis quite a bit. Keep me posted....more than happy to help. By the way....I own all GM's too...lol...haven't learned my lesson yet
1995 GMC Jimmy
on Dec 11, 2014
I have a 1995 GMC Jimmy that won't start.
It sounds like a faulty fuel pressure regulator. When you turn the key to the on position the fuel pump starts for an instant to build pressure in the fuel line. If the pressure regulator has allowed too much leakage since the last start then the fuel pump does not have enough time to prime the line. The fuel pressure will still measure ok when the car is running because the leakage is very low. Try turning the key off and on a few times prior to starting and see if the extra pump priming steps help. Also check the vacuum line to the regulator because it needs vacuum to work correctly.
1995 GMC Jimmy
on Dec 01, 2014
Not finding what you are looking for?