2000 Cadillac Escalade Cylinder one missfire

SPANKYFREE

MEMBER
2000 CADILLAC ESCALADE
V8
4WD
MANUAL
87,000 MILES

One morning I started the car & it ran rough & I got a service engine light. I replaced the plugs, wires, cap & rotor. It runs a little better but I still get this code PO301. I can't get it inspected until I get this code to go away. I have a 5.7 L with thottle body injection so it can't be the injector or the one coil. I unpluged the EGR valve & got a low input voltage reading. I unplug the sensor before the MAF sensor & nothing happens. Is this the problem? I can't aford to take it to the Cadi dealer. Please help.

Monday, March 10th, 2008 AT 5:10 AM

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Check no.1 cyl compression

Was this

answer

helpful?

Yes

No

Monday, March 10th, 2008 AT 6:09 AM

ROWTIEAR

MEMBER
91 POSTS

A 2000 Escalade should not have throttle body injection, ( although it does have a throttle body)
It should have one injector per cylinder located below the upper intake manifold along with the fuel pressure regulator.
On these engines faulty injectors were quite common, unfortunately you cannot see them without removing the upper intake manifold to expose what is called the spider.
If you know someone with a snap on scanner, you can perform an injector balance test to see if the injector is working properly. If not you may just have to take a chance and replace the injector.
You can also try a good injector cleaning, this may help depending on how bad shape it is in.
Hope this helps!

Was this

answer

helpful?

Yes

No

Monday, March 10th, 2008 AT 6:40 AM

BUZZSAW

MECHANIC
1,198 POSTS

I would say its your coil pack for #1 cylinder, exchange with another 1 from another cylinder and see if misfire changes to that cylinder, if it doesnt then go for the Injector

Was this

answer

helpful?

Yes

No

Monday, March 10th, 2008 AT 2:25 PM