hard to start when warm or running temperature
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 43
Likes: 0
From: Bear Delaware
hard to start when warm or running temperature
My 89 will start impressively quick when cold. Even after sitting for weeks. Don't have a garage. I keep it under two covers. In dead of winter it will start as soon as you turn the key.
However, after running for a short drive or long drive. If it sits for a few minutes to fill up with gas, or even two hours it will take about 3-5 seconds to start.
Any info, tips, or remedies would be greatly appreciated!
Thanks
Joe
However, after running for a short drive or long drive. If it sits for a few minutes to fill up with gas, or even two hours it will take about 3-5 seconds to start.
Any info, tips, or remedies would be greatly appreciated!
Thanks
Joe
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
First thing I would do is check the usual culprits. How good is your spark? Plugs good? Run the car into a dark garage at night and open enough to let exhaust out. Run car and spray a fine mist AROUND, NOT AT, AROUND the plug wires and see if it leaks. If that is fine, how are your plugs? Are the the right kind and good? Take a known good plug remove the boot when it is hot and run the car. Now plug the new plug in and ground the threads. Do you have a blue flame?
If that checks out, how is your throttle body? Have you cleaned the IAC passages and the IAC by removing the housing from the TB? Do you have any vacuum leaks? I was sure I didn't but found them from cracked hoses. Is you minimum idle set right? You can follow the stock procedure if the car is stock but if not, set with a scanner using IAC counts.
Next thing. Fuel. How is your fuel? Can you tape a gauge onto the glass and drive a couple of WOT runs? Does the pressure drop off and how much? After shutdown, assuming you have a stock regulator, do you have fuel pressure or does it lose pressure fast? Get a scanner so you can see fuel pump voltage to look for drop off at WOT. Finally, if you have stock injectors, there is one place for them. Circular File. Get reman injectors. I chased a problem with a car till I got rebuilt injectors.
If that checks out, how is your throttle body? Have you cleaned the IAC passages and the IAC by removing the housing from the TB? Do you have any vacuum leaks? I was sure I didn't but found them from cracked hoses. Is you minimum idle set right? You can follow the stock procedure if the car is stock but if not, set with a scanner using IAC counts.
Next thing. Fuel. How is your fuel? Can you tape a gauge onto the glass and drive a couple of WOT runs? Does the pressure drop off and how much? After shutdown, assuming you have a stock regulator, do you have fuel pressure or does it lose pressure fast? Get a scanner so you can see fuel pump voltage to look for drop off at WOT. Finally, if you have stock injectors, there is one place for them. Circular File. Get reman injectors. I chased a problem with a car till I got rebuilt injectors.
Melting Slicks
Joined: Jan 2001
Posts: 2,940
Likes: 5
From: Chesapeake VA
My 86' had a hard warm start issue. The original injectors had started to leak from wear/buildup. This caused a "flooded" condition upon warm start, but if the car sat overnight the majority of the fuel would evaporate and the car would start fine cold.
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
Didn't your 86 come with a cold start injector just for starting purposes?
