I have an 87, 48.5K miles, with the stock TPI with no mods except a new cat-back Magnaflow exhaust (which sounds awesome).

It starts great when cold...Instant fire-up. However when it is warm and I go to restart it, like when I run into a store for a few minutes, the starting is sluggish and I get a puff of smoke, like the car is flooding.

Makes no difference if I start it with foot on or off the pedal. Not sure sure where to begin.

I've been reading about a cold start injector. Is it possible that the sensor is not being told the engine is already warm and fires extra fuel?



While I have spent most of my time working on my old '84 C4 with cross fire, I have not done anything with the injectors on this car..new territory for me.

The car runs and idles fantastic once started. Nice and steady idle about 700 RPMs.

The only other odd thing I have since I got the car 2 years ago. I notice is after starting the car, when back down my driveway, I get a 2-second motor noise coming from the rear of the car. The only motors I know of there are the antenna (which is disconnected) and then the fuel pump in the tank. I only hear it the one time after starting the car. What's strange is the car can run fine parked in the garage and I don't hear it until I start backing down my pitched driveway it goes off, almost like it is tied to the brakes and nothing fuel related.

Any ideas/suggestions appreciated.

 

If your 87 has ABS thats the self check system doing its thing normal

On the start do you have any codes?
Suspect of the (perhaps a leaky one)injector/CTS sensor but its a WAG dont put much stock in it

If you pull the vacuum hose off the fuel pressure regulator is it wet with fuel? Checked fuel pressure with car off in the run position then running and off again to see if its bleeding down? Hookup is on the fuel rail

 

Have no pressure gage at this time, but will get one. No codes showing.

As for the ABS, that makes sense. Sounds like when it would when working.

 

had the same issues. my guess is two problems causing fuel pressure to bleed off quickly. leaking injectors and a ruptured fuel pulsator. changing out the pulsator with a short piece of fuel hose is an easy quick fix.

 

Scott did you ever solve this issue? I have the exact same problem.

 

Short answer
Smell for fuel in the vacumm hose to the FPR. Replace FPR diaphragm.
Read fuel pressure drop at rail.
Replace injectors or pulsator.

 

Another free-bee check is pull the connector off the ninth injector.
See if the original problem continues

 

When my 87 was spinning over more than it should sometimes it turned out to be the fuel pump relay.

The part that turned the fuel pump on from the key/computer wasn't kicking it in and it was having to build up oil pressure to make the fuel pump relay kick on.

 

sounds like injectors leaking raw fuel into the intake ports to me.