|
Register To Post |
jwardg | Tune Up on 90 C4 | ||
Guru Newb
|
The engine in my 90 C4 seems to be skipping when at idle and definetly has rough acceleration. Im thinking I have a bad plug, plug wire or maybe a fuel injector. I replaced plugs and wires about 2yrs ago and replace all 8 injectors last year.
So I have a day off coming so I thought Id start by replacing the plugs and wires, if for no other reason than TLC. Are there any aftermarket plugs and wires that are recommended that would be considered an upgrade or performance enhancement to the OEM AC delco plugs and wires? Thanks, jwardg |
||
Posted on: 2013/10/9 15:23
|
|||
Transfer |
TommyT-Bone | Re: Tune Up on 90 C4 | ||
Chair-man of the bored
|
I think troubleshooting would be better than just throwing parts at it. Those are relatively new parts. Check back later and one of the tech gurus around here will give you some solid advice, I'm sure. |
||
Posted on: 2013/10/9 15:29
|
|||
Transfer |
bogus | Re: Tune Up on 90 C4 | ||
Grand Imperial Pooh-Bah
|
Tommy is right...
But since you asked, I suggest NGK plugs and Taylor or MSD Wires. With that said, the idle issues could as easily be caused by a bad or slow O2 sensor... or a clogged up IAC valve housing. |
||
Posted on: 2013/10/9 15:39
|
|||
_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
|||
Transfer |
Woodstock | Re: Tune Up on 90 C4 | ||
Senior Guru
|
Check fuel pressure, also is it holding when the engine is shut off.
My guess would be fuel pump. |
||
Posted on: 2013/10/9 18:52
|
|||
_________________
91 convertible |
|||
Transfer |
Matatk | Re: Tune Up on 90 C4 | ||
Webmaster
|
I'm going to assume there aren't super high miles on those items since you replaced them?
You can pull the easiest plug just to check it, but I doubt they need replacement. Wires should be good. You can run the car at night with the hood open or in a dark garage and check for any arcing. Make sure all the wire boots are pressed on snug and there is no insulation that is worn away and grounding. Like Andy said, check the IAC, it is probably time for a good cleaning along with the rest of the throttle body. As Axel pointed out, check the fuel pressure. |
||
Posted on: 2013/10/9 20:29
|
|||
_________________
2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
|||
Transfer |
Matatk | Re: Tune Up on 90 C4 | ||
Webmaster
|
Another thing I thought of, what is the condition of the cap / rotor? Have you inspected those at all? They are also wear / maintenance items.
Hope that helps, Matthew |
||
Posted on: 2013/10/10 12:32
|
|||
_________________
2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
|||
Transfer |
jwardg | Re: Tune Up on 90 C4 | ||
Guru Newb
|
Thanks for everyones, input. Well after doing all of the tune up items myself over the past four years(plugs, wires, distributor, injectors,etc)
I decided it was time to take it to a shop,and Im glad I did. They put it on a scope and found that I had two bad plugs, and one of the terminal pins on the top of the distributor cap was broken as it came off when they removed one of the plug wires. Plugs,wires,cap are less than two years old, so I was a little surprised, but sometimes diagnositic equipment can see what the eye can't. Anyway, its running better than ever. Still a work in progress, but Im enjoying the ride! |
||
Posted on: 2013/11/4 19:21
|
|||
Transfer |
TommyT-Bone | Re: Tune Up on 90 C4 | ||
Chair-man of the bored
|
|
||
Posted on: 2013/11/4 19:25
|
|||
Transfer |
Matatk | Re: Tune Up on 90 C4 | ||
Webmaster
|
Good to hear!
|
||
Posted on: 2013/11/5 0:51
|
|||
_________________
2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
|||
Transfer |
bogus | Re: Tune Up on 90 C4 | ||
Grand Imperial Pooh-Bah
|
excellent!
As for parts breaking... par for the course anymore... get good parts, MSD, AC Delco, might help mitigate that failure. Same with plugs... NGK is my personal choice. |
||
Posted on: 2013/11/5 3:14
|
|||
_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
|||
Transfer |
mechguy79 | Re: Tune Up on 90 C4 | ||
Guru Newb
|
I just did wires myself. I got the MSD set you make yourself. Those are pretty cool, and they come with extra parts in case one of the wire ends come off. I will definitely use something like these from now on. Oh, and I have removed them several times now while troubleshooting, and no ends have come off.
|
||
Posted on: 2013/11/25 1:23
|
|||
Transfer |
istter1 | Re: Tune Up on 90 C4 | ||
Elite Guru
|
Good job
|
||
Posted on: 2013/11/25 1:56
|
|||
_________________
Only I can change my life. No one can do it for me. Carol Burnett |
|||
Transfer |
You can view topic.
You cannot start a new topic.
You cannot reply to posts.
You cannot edit your posts.
You cannot delete your posts.
You cannot add new polls.
You cannot vote in polls.
You cannot attach files to posts.
You cannot post without approval.
|