98 Z28

My car sometimes starts right up, or takes a few tries or backfires really bad multiple times after i stop trying to start it. Could this be a bad cam sensor or crank sensor? Any other sugestions?

12secSS

iTrader: (30)

The crank sensor is used for timing, and the cam sensor is used to find out when TDC is. It could be a bad connection. Can you get it scanned for codes, that will tell you right away.

98 Z28

I'm going to go bring it up to autozone to see.

98 Z28

It is the cam sensor. Is that the sensor on the driver side of the car towards the front of the engine?

peterock98

iTrader: (25)

If your talking about the one on the side of the head that is the coolant sensor...my 98 pops and backfires when it's cold ,then it goes away when it warms up.

12secSS

iTrader: (30)

The cam sensor is in the back of the block, next to the MAP sensor. Reach behind your intake on the driver's side and you should feel it next to the Oil Pressure sending unit.

peterock98

iTrader: (25)

Have you checked your spark plug wires?

98 Z28

Yeah all the wires and plugs are all new from when I did the headers. That is when all these problems started I wonder if i messed something up when i pulled the rubber hose from egr valves out. Or are there any wires from it that can come in contact with the headers?

peterock98

iTrader: (25)

When I installed my longtubes on the passenger side there was a sliver colored wire loom that rested on the header for an short time during start up, I was luckly it didn't burn threw.So start checking for burnt wires .Make sure you O2 sensors are routed away from the headers.Also is the check engine light on

ccsanders01

iTrader: (1)

sounds like a lean start like a carb with no choke when cold

jattgunman

iTrader: (1)

You Probally cracked the porcelian on one of your spark plugs, that happended to my car after a header install and it took forever to figure out, check ALL your plugs for a hairline crack

98 Z28

It does have the check engine light on for the rear 02s, air, egr, and cam sensor.

Would it run perfectly fine once it starts with a cracked plug?

peterock98

iTrader: (25)

I would change the cam sensor first.Than get the car dyno tuned .Get rid of the air pump and the egr valve and rear o2''s

98 Z28

Yeah im going to change the sensor. I may just buy hp tuners so i can try and tune it myself. Lol i just wish the stupid sensor would have went bad when i had the intake off to change the oil sensor.