1990 Ford F-150 Shakes Between 1000 & 1500 rpm
#11
RE: 1990 Ford F-150 Shakes Between 1000 & 1500 rpm
I will be glad to remove the radiator if this is the problem. I've been dinking around with it all week and I'm itching for a solution. (Hopefully an inexpensive solution; I don't think balancers are too pricey.)[sm=burnout.gif]
#12
RE: 1990 Ford F-150 Shakes Between 1000 & 1500 rpm
Last time I bought one was several yrs, ago thru FORD , think it was like $80.00 ?, Well should be ppl here on an off Tomm. so if you can , or get stuck somehow . Come on back An we'll see what we can do .
#14
RE: 1990 Ford F-150 Shakes Between 1000 & 1500 rpm
My '99 F-150 has a little bit of a shake to it at that rpm range, but its only at idle. When you are driving with the engine between 1,000-1500 rpm it doesnt shake.
Octane
Octane
#15
RE: 1990 Ford F-150 Shakes Between 1000 & 1500 rpm
I checked out the balancer, and it seems to be fine. I pulled each plug wire off individually while the engine was running and I found that there was one cylinder that didn't effect the engine idle when I pulled the plug wire off. I pulled the plug out and started the engine and it had spark, but there wasn't any fuel/air mixture that came out of the hole where the plug was. I put some injectoer cleaner in the tank and drove for a while, and it seemed to get somewhat better, but not perfect. I filled the tank after driving and put more cleaner in. I will see if this makes a difference, but I'll have to hook up to a computer to see if I'm getting a code for this.
#16
RE: 1990 Ford F-150 Shakes Between 1000 & 1500 rpm
Wouldnt be the first time I had a bad spark plug that wouldnt fire under pressure, but spark ok outta of the motor . Back in the day we had a plug tester -- that basically put the plug under a load, An it had a window to look through to see the plug was firing. You dont see them these days !!!!!. And your only going to get a TINY bit of fuel outta a cylinder, Its not like you can crank it over an see a mist coming out . , An its quite possible you got a plugged / bad injector , probaly the best thing you can do is go an get the fuel system flushed , I think its like $ 80.00 bucks these days , will make a world of diff. in the way it runs . !!!
#17
RE: 1990 Ford F-150 Shakes Between 1000 & 1500 rpm
I wouldn't think that the plugs won't fire when under pressure because everything from the coil to the plugs is new, but that doesn't mean it isn't happening. I still want to see what kind of codes I get from it. I think a fuel system flush would be a good idea, too. I did use it again today and it is running MUCH better, but not perfect. It still wants to shake sometimes, but only around 900-1100 rpm. It isn't as intense as it used to be, either. I will let everyone know what I find with the codes.
#18
RE: 1990 Ford F-150 Shakes Between 1000 & 1500 rpm
Will then the code is going to be missing fire on # cylinder, or random misfire. Its best to have a shop do the injector cleaner. They have to shutoff fuel pump and tie in to the fuel line with the injector cleaner machine.
#19
RE: 1990 Ford F-150 Shakes Between 1000 & 1500 rpm
Had the same problem! My 98 would almost go dead when stopped at a red light. I had a vacuum leak. Real difficult to find. It was on a 90 degree rubber boot located on the bottom side of the intake manifold, at the front of the engine. It appeared to get hot and literally melt. A mechanic qouted me a price of 200$. He said the manifold would have to be removed to make the repairs. I was able to change the boot myself with a little work and didn't have to remove the manifold. It was real tight but definately capeable. I think the mechanic was trying to make some easy money. The part cost $12 at the dealership. The counter man knew exactly what part I needed, as if he had sold a few.
#20
RE: 1990 Ford F-150 Shakes Between 1000 & 1500 rpm
I inspected the vacuum lines once already, but that doesn't mean I missed or overlooked something. I did buy a code tester the otherday, and I plan to use it tonight. I will keep everyone posted.