1994 Jeep Grand Cherokee Engine Size : 4.0
Question: starts hard cold. Reaches operating temperature starts fine.check engine light comes on right before cold start.

Answer: The first thing to do is get a scan of the computer codes. Most of the large parts store chains will do this for free. This may give an indication as to what part of the emission system is having the problem. You would then need to have the fuel pressure checked. A weak fuel pump can cause this problem on your Jeep. Also check for carbon buildup in the throttle body bore and plate. Cold engine should have a high idle until it warms up, so if you have a problem with cold starting, it may be an idle problem related to carbon in the throttle or the idle control valve. Also check for a vacuum leak. A vacuum leak causes a lean condition. This will effect starting on a cold engine more than on a warm or hot engine.

More Auto Repair Help


Leave your comments

Post comment as a guest

0
  • No comments yet.

Latest Articles

2005 Chevy Trailblazer Check ...

Hello, My check engine light and now my ABS light in my truck won't go off. They've been on for ...

06 f150 5.4 missing on 5 ...

I purchased a truck that had caught on fire. Just give me your best guess. The truck had an ...

1997 dodge ram 1500 4wheel ...

My front passenger wheel feels like its going to wobble off . I checked the lug nuts and they are ...

Chrysler Sebring Throttle ...

Chrysler Sebring convertible the electronic throttle control warning light is flashing. Car has ...

Land Rover codes and what to ...

I have codes on a 2003 land rover Freelander, the code are P0420, p1472, P1477, and P0174, how do i ...

Log In Or Register
? The Benefits

How Things Work

Power Steering- Electric- How Does It Work

The electric power steering (EPS) system reduces the amount of effort needed to steer the vehicle. The system uses the body control module (BCM), power steering control module (PSCM), torque sensor, discrete battery voltage supply circuit, EPS motor, serial data bus, and the instrument panel cluster (IPC) message center to perform the system functions.

Read more...

Common Engine Codes

Engine Misfire Code P0300 - P0308

The powertrain control module (PCM) uses information from the ignition control (IC) module and the camshaft position (CMP) sensor in order to determine when an engine misfire is occurring. By monitoring the variations in the crankshaft rotation speed for each cylinder the PCM is able to detect individual misfire events.

Read more...

Be Social With Us !

FacebookRedditPinterest