Surefire Automotive's Blog

2000 Jeep Cherokee Check Engine Light

surefire — Sat, 23 Oct 2010 11:06:22 +0000

Here is something to consider for all the Jeep owners. A very common problem which turns on the “check engine” light are vacuum lines that have deteriorated and either come loose or have cracked. Many times these vacuum lines will store an EVAP system fault code. Many of these faults can be corrected by searching for faulty lines tracing back to the EVAP canister, the Leak Detection Pump, the fuel tank or the Engine. I just recently, within the past month have had two 4.0l Cherokees with “check engine” light complaints, repaired by replacing a deteriorated vacuum elbow at the intake manifold. This particular line is the vacuum supply to the LDP and had triggered a P1494 fault.

I have also seen on Cherokees the vapor line from the fuel tank to the vapor canister, which is a steel line in this instance, become so rusted an corroded they cause fuel vapor leaks causing a PO455 fault and triggering the MIL light.

Chrysler/Dodge products from the early 2000’s are pretty prone to this type of failure.

2003 BMW 745LI Headlight blown out

surefire — Tue, 05 Oct 2010 16:08:33 +0000

Customer complaint of the left front headlight blown out…just a bulb replacement, right? Not so easy on a luxury BMW. The headlights are HID bulbs, you know the beautiful blue lights that light up like the space shuttle. The bulb was replaced with an after market brand,(which illuminated white instead of blue) but went right back out after a few seconds. There is a bunch of different information from BMW about the headlights, depending on the application. This particular problem traced back to the Headlight control module which is mounted on the bottom of the headlamp assembly. BMW service manuals require the front bumper cover to be removed and the dealership asks for over $700 for the module. We found one on Ebay for $115 bucks and found that the cover need only be loosened on the side we were changing. After removing the headlamp assembly, the module just unbolts from the bottom. Pretty Easy.

2006 chevy uplander 3.5L no start diagnosis.

surefire — Thu, 09 Sep 2010 19:31:43 +0000

No start/hard start on a 3.5l Uplander.visual inspection of engine found the plastic pcv tube loose from the cold air induction tube between the throttle body and Mass air flow meter. The tube is all distended from oil entering from the pcv valve replaced the pcv valve, cleaned the throttle body, and reattached the tube using a nylon tie to secure. Away she goes…..

2003 Jeep Liberty 3.7l EVAP SYSTEM PO455

surefire — Thu, 09 Sep 2010 19:27:16 +0000

Diagnosis of po455 on a Jeep Liberty 3.7. Had previously changed the Leak detection pump and repaired leaks in the lines to the evap canister. smoke diagnosis of the system found: when connecting smoke machine at line from canister to the purge solenoid at the canister, smoke was entering the intake manifold. disconnected and plugged line at the purge solenoid and system held. vacuum check of solenoid found solenoid passing vacuum while de-energized. Natural state of solenoid is closed. replaced purge solenoid and retest using the EVAP system test on the solus….All is well

2000 Honda Accord Check Engine Light

surefire — Thu, 09 Sep 2010 19:19:38 +0000

Yes, accord comes in with a p1457 code which is an evap system fault. Honda has a tsb about bypass solenoids shorting out in climates like the northeast. recommends replacing the bypass solenoid and the two way valve it attaches to. If, when removed, the two way valve has any water or gasoline in it. There is a serious danger in these vehicle to damage the EVAP system if topping off at the pump is a habit. Water from extreme weather or gasoline from topping off contaminates the two way valve and shorts the solenoid winding. Spec for the winding is 30 ohms. winding in this solenoid measured .3 ohms. replaced two way valve and solenoid and test drove until EVAP monitor ran. All systems go…..

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surefire — Tue, 16 Jun 2009 13:23:46 +0000

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