Hi,

I have a 97 1500 5.2 4X4 and yesterday the truck started loosing power to the point that today, it's very hard to start. Went to Autozone and they ran a code check. Came up with multiple miss fire on I believe all the cylinders. I changed all spark plugs with the Bosch Supers (I hope those will work) and spark tested all plugs. They all have spark. I changed the dizzy rotor less than a year ago. Disconnected the fuel line and the fuel pumped fine during priming. Checked all injector resistance and all read 11.6 ohms. Right now, I am at a lost. Any suggestions greatly appreciated.

 

Did you try replacing the distributor cap???? I had a ford that had shorted spark plug wires and it did the same thing you are talking about.the wires had rubbed together and shorted to each other. It was really hard to find that problem. Good luck hope this helps

 

with multiple miss-fires... change cap & rotor 1st, then if that doesnt fix it check your cam sensor... this (if i remember correctly) sets the fuel sync... it's located in the distributor.

 

I could see it being a faulty crank position sensor too, that works in combination with the cam position sensor to get the fuel sync correct.

 

yeah but when that starts to go bad, your truck is dead from what i hear... (have no experience with a bad crank or cam sensor on my own truck)

 

I've had one that was getting intermittent signal, so the injectors were getting out of time with the spark. Was very much bad. Put a new crank position sensor on it and it fixed it. I could see a cam position sensor doing the exact same thing with the exact same symptom, cause they're essentially doing the exact same thing, only one's on the crank and one's on the cam.

 

what did the crank sensor run you?

 

About $100. Luckily it wasn't for my truck, was for a friend so he had to foot the bill.

 

The dizzy cap was changed less than a year ago as well. Sounds like what you guys are saying that my fuel injection may be off sync. I'll have to check the cam and crank angle sensors.

Also, can a distributor be bad even if there is spark?

 

I'd still change the cap and rotor first, easiest and cheapest thing to do. It could have gotten moisture inside of it and corroded.

The distributor could be bad and you still have spark. It's highly unlikely, but it could happen. I've also heard of the computer going bad and doing stuff like this.