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Search Auto Parts Search Very Poor Performance Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine Troubleshooting astrovan New User May 21, 2015, 10:16 PM Post #1 of 3 (1065 views) Very Poor Performance Sign In 1990 Astro Van with replaced engine (from 1990 C1500 pickup). Unknown true mileage since engine was replaced, and I don't know when. Van was running rough, and would stall. This occurred all at once, with no warning. I first thought I was out of gas, but that wasn't the problem. After it finally wouldn't stay started at all, I had it towed to shop, and mechanic replaced the throttle body (figured there was a crack somewhere in it, since the vacuum was gushing out, and nothing else he did - replaced a gasket - solved the problem. It is now running, but still very poorly. Acceleration gives it no power, and idle makes it want to die - but it hasn't died on me yet. Can you give me some ideas? I'm thinking about the MAF sensor, and I wonder where this is located. Would it be under the engine cover inside the cab, or under the hood, and what would it look like? Tom Greenleaf Ultimate Carjunky / Moderator May 22, 2015, 2:37 AM Post #2 of 3 (1052 views) Re: Very Poor Performance Sign In "Vacuum gushing out?" Whatever that means? Guess I'd begin with a compression test on this t see what you have. Maybe even valve timing has jumped, exhaust restriction and so on. Find out just what you have to work with as you don't seem to really know, T Discretesignals Ultimate Carjunky / Moderator May 22, 2015, 4:28 AM Post #3 of 3 (1044 views) Re: Very Poor Performance Sign In TBI fuel system on that engine doesn't use a MAF sensor. It is speed density which uses a MAP sensor. Does the check engine light work? If is it on, check for codes in the ECM by jumpering A to B in ALDL connector. Count the flashes of the check engine lamp. They will be two digit codes. First thing you should do is a compression check. Make sure the battery is fully charged and the starter is cranking the engine at a good speed. Unplug the distributor electrical connector and hold the throttle wide open when you do your check. Write down your numbers. 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 May 22, 2015, 4:29 AM)   Email This Post   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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