HT4100 4.1, 4.5, 4.9 Discussion, 89 Eldorado engine misfire in Cadillac Engine Technical Discussion; Hi everyone, I have an 89 Eldorado that progressively started missing worse than it has in the past. Anyway, the ...
Hi everyone, I have an 89 Eldorado that progressively started missing worse than it has in the past. Anyway, the other day, going down the freeway, I could feel the car missing, at least that's what it felt like. Going up hills, the car would give a big "jerk" like it had just had a really bad miss while under load. The ignition module was replaced recently thinking that would fix the problem, but it hasn't. There are no codes set. I don't know how old the plug wires are, could they be the problem? Any suggestions would be appreciated. Thanks.
Automobile(s): '87 Coupe DeVille 4.1L FWD(New engine '08)1981 F100 '03FXDL
Re: 89 Eldorado engine misfire
There are a few ways to check a misfiring plug. Cheap testers that attach between a spark plug and its wire will show if electricity is getting to the plug. Pulling each plug and reading it's condition is the tried/true way. Wires deteriorate over time, especially due to heat in the engine bay. If those plug wires are 10yrs/older, it would be a good/smart investment to replace them with a quality set. Replacing the plugs with the correct type is also a good idea.
Well, I finally got my wires replaced. Almost got my arm stuck while replacing number 2.. During the process, I removed the throttle body/air filter unit and noticed that one of the connectors to an injector was crooked. The retaining clips were broke and one of the electrical connectors is broken off off the injector. So should I replace just one injector, or both? What other parts do I need, throttle body gasket set? Thanks for any input.
so you just needed a tune up ? Mine dose the same thing so right now im in the proses of doing a full tune up on her i hope that fixes it if not im thinking its the trans slipping. O how i dread changing out the trans its such a PITA . But in case i do have to change out the trans can the engien and the trans come out together or do the have to come out one at a time ? I've done it before but the last time i did it i took it out separate and i tiring to make it a little easier on myself.
Well, the thing that I've discovered on the housing that goes on top of the Throttle body unit is so tight to the connectors for the injectors, is if you aren't careful, you can actually break those connectors because that housing is kind of a pain to get on and off with all the hoses connected to it since some of those hoses aren't very flexible when it's cold. Anyway, after closer inspection, I could see that over the years, the corners of the injector connectors had been busted off from removing and installing the housing. I think one of the injectors was only firing intermittently because the connector and injector pin was getting ready to break, and then I broke off all the way. Now it runs pretty good and I think I'll just leave everything alone...