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Overheating/Coolant/Start-Up Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Car Troubleshooting haynes83 New User Apr 5, 2012, 6:11 PM Post #1 of 3 (1765 views) Overheating/Coolant/Start-Up Sign In Hello, I have a 1998 Civic LX with a D16Y7 engine. It has 220,000 miles and the only major maintenance that has been performed is an exhaust manifold replacement (due to a crack) which apparently is a common issue with this model. The symptoms I have been having for the past week are as follows: The temperature gauge starts to climb towards H while the car is sitting in traffic or idling for a lengthy period of time. When the car starts moving again, the temperature gauge retreats to normal operating temperature. The coolant level seems to be slowly leaking as I have added around ½ gallon in the past couple weeks. There is no external leak showing and there is no smoking in the exhaust. Recently, my car has had sputtering issues on cold start-up (usually after sitting overnight). The sputtering only lasts for a couple seconds and then the engine runs perfectly. One of these start-ups presented a check engine code of PO301 and P1399 (random and cylinder 1 misfires). Any idea as to the cause of these symptoms? Thanks! Hammer Time Ultimate Carjunky / Moderator Apr 5, 2012, 6:27 PM Post #2 of 3 (1748 views) Re: Overheating/Coolant/Start-Up Sign In The PO301 is a misfire on #1 but the P1399 doesn't even exist. Pressure test the cooling system for leaks and check to see if the fans are coming on when it gets hot. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. Discretesignals Ultimate Carjunky / Moderator Apr 5, 2012, 6:32 PM Post #3 of 3 (1744 views) Re: Overheating/Coolant/Start-Up Sign In It's possible you could have a leaking head gasket around number #1 cylinder that lets coolant leak into the cylinder while the engine is cooled down. The engine misses when you first start it and clears up once the coolant is burned off. You should get hold of a pressure tester and then remove all the spark plugs. Pressurize the system and go to bed. The next morning look down into the #1 cylinder and see if there is coolant laying on top of the piston. You also might want to check the operation of your electric cooling fans. If they don't come on, the engine will run hot when your sitting at a light. A bad cooling fan could of taken out the head gasket from the engine running hot one too many times. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved. (This post was edited by Discretesignals on Apr 5, 2012, 6:33 PM)   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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