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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   1989 toyota pickup 3.0 crank no start I have a 1989 toyota pickup 3.0 crank no...   Strut spring orientation and strut mount tension nut 2017 Nissan rogue awd 2.5 L Put in Monro...   Transmission stuck in part, I have tried everything So I'm working on my elderly fathers 201...   2017 dodge journey LED headlights on/off randomly Year of vehicle 2017 Make of vehicle dod...   Kia Soul starter replacement issues! Okay so my car is a 2010 Kia soul 2.0 en...   Please Help - Knock sound & engine fail Hi all, Hoping to get some insight and ...   multiple warning lights 2013 GMC Terrain 130,000 miles 4 cylinde...   03 alero no low speed blower Good day everyone, I have a 2003 Olds a...   04 Chevy 2500hd tail light issues Help!!! I have changed my combo switch...   1999 Grand Caravan Sport not starting. Hi. I'm new here. I hope someone can hel...

1985 pontiac fiero gt auto v6 Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine Troubleshooting nbombjesus Novice Nov 1, 2006, 2:52 PM Post #1 of 5 (3555 views) 1985 pontiac fiero gt auto v6 Sign In My 1985 pontiac fiero gt auto v6 is hesatating when shifting itself...i just did a tune-up on it and put a new battery on it...and still the same thing. so i have no idea what's wrong with. If i drive the car for a about 30 minutes to warm up it seems to stop doing the hesistating but it i have also noticed that i lost some horsepower. any help would be appreicated thanks!!! DanD Veteran / Moderator Nov 2, 2006, 2:48 AM Post #2 of 5 (3496 views) Re: 1985 pontiac fiero gt auto v6 Sign In I’m guessing at a vacuum leak; broken lines, intake manifold gasket anything that will allow unmetered air into the engine? The computer relies/assumes that all incoming air is through the throttle. A vacuum leak throws a wrench into the computer’s calculations and limitations. A cold engine requires a rich fuel mixture; if this is a vacuum leak; the computer may not be able to compensate (add enough fuel). Once the engine has warmed needing less fuel the requirements fall back to where the computer can compensate for a leak? How to find a vacuum leak is kind of a search and rescue operation; some leaks are easily found if it’s external but then there are the internal leaks. I have a 3.1 Chevy in the shop right now; it came in backfiring because of a bad ignition module. Once the module and the backfiring were repaired the engine still was not running properly. We found that there was a vacuum leak but it’s not external that can be seen. The intake gasket had blown out on the inside of the engine; drawing air from the crankcase. Likely due to the excessive pressures caused by the backfiring. So what I’m getting at is there’s no real way of explaining how to find a vacuum leak other then experience, knowing what to look for and of course a bit of luck. I’ve only spoke of vacuum leaks but there are hundreds of other reasons for a cold hesitation that again takes experience and equipment to find. Dan. Canadian "EH" nbombjesus Novice Nov 7, 2006, 11:17 PM Post #3 of 5 (3480 views) different engine Sign In Okay so i did some looking and my engine in my fiero is not the one that was factory installed. I figured this out when i didn't see the fiero logo on the top...and plus it isn't red....anyways I just did a tune-up recently as posted before. Is it possible that the engine i have in my car uses different spark plugs, spark plug wires, distibuter rotor..and cap? i am not too sure what king od engine i have...but it fits just like the fiero engine would...but it's it. bryang New User Nov 9, 2006, 12:27 PM Post #4 of 5 (3469 views) Re: different engine Sign In What kind of engine is in it is it a v-8 v-6 or 4 banger. I had a gt once and the problem that I had was the injectors had popped a fuse. Try checking all the fuses. They are located under the dash on the drivers side above were your shin would be if you were sitting in the car. Good luck trying to find a comfortable possition to work in to do this. Tom Greenleaf Ultimate Carjunky / Moderator Nov 9, 2006, 1:08 PM Post #5 of 5 (3468 views) Re: different engine Sign In Back to top the person said it was a V6. I don't think a V8 was available, T   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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