1997 Hyundai Tiburon Engine Miss

FRANK1952

MEMBER
1997 HYUNDAI TIBURON

Engine Mechanical problem
1997 Hyundai Tiburon 4 cyl Two Wheel Drive Manual

I have a miss on #1 cyl. I have replaced the spark plug; spark plug wire; fuel injector; and coil pack. Ran a compression on cly and have 90 lbs, so I "assume" that should be enough to fire the cyl. Hooked up a scanner and it shows that #1 cyl. Has "miss-fired" but I am at a loss. I am going to pull the valve cover to see if there is a broken valve spring, but I would think that would effect the compression, unless its on the intake side. I know its the #1, because when I remove the plug wire it makes no difference in the engine. Any help would be great.

5 Replies

TOOOMANYTOYS

MECHANIC
513 POSTS

Check the injector pulse with a noid light. If it is pulsing then you might want to do a running compression test and compare it to another cylinder.

Was this

answer

helpful?

Yes

No

Friday, March 12th, 2010 AT 8:40 AM

FRANK1952

MEMBER
3 POSTS

I tested the connection with my 12 volt light tester and it was getting current on one side and a pulse on the other.

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Friday, March 12th, 2010 AT 8:45 AM

TOOOMANYTOYS

MECHANIC
513 POSTS

Try the running compression test. You might be on the right track with a valve issue.

Was this

answer

helpful?

Yes

No

Friday, March 12th, 2010 AT 5:06 PM

FRANK1952

MEMBER
3 POSTS

I found the problem (well sorta). The injector is not getting a pulse signal. However, when I run a wire from the pulse side and briefly touch it to ground, it arcs and then it will work for a while. You can't leave it on the ground because it will short out, so any suggestions?

Was this

answer

helpful?

Yes

No

Friday, March 12th, 2010 AT 6:36 PM

TOOOMANYTOYS

MECHANIC
513 POSTS

TGrace the wires back to the pcm. If they are not pulsing there you may have a problem with the pcm. Also check for power and a good ground to the pcm