I went to walmart today a 20 minute drive for a tarp came out to the z28 and fired it up went to the stop sign turned out and it coughed and stumbled like running out of gas i shoved it in nuetral and reved it which it did fine put back in drive and it died. Crank crank crank nothing so got it on the trailer and was at home did nothing to it i jumped in it to let a friend hear it and it fired right up. The more i think about it at walmart when i went to start it i dont remember the fuel pump coming on. Any ideas its kinda got me gun shy now. In the garage now at home the pump comes on. Its a 94 z28 no mods only exhaust and a kill switch so thieves cant steal it on the battery. 126000 miles any ideas would be great thank you

 

the same problems happened to me and it ended up being the opti.. drive it around more to see if anything else happenes. just be close to your home

 

Scan it for codes. Check the fuel pressure under max load.

 

Ill drive it around this week after work. Just funny how after being trailered home it startef right up no hesitation. It has a new fuel pump around 88000 miles so iwas goito fbuy a new fuel filter after work today. How much is a new opti

 

If you determine it's the Opti and need to replace it, you should not consider any replacement other than the Delco or Delphi unit. I think they run about $350-400. The cheaper aftermarket units often fail right out of the box, or shortly after installation.

But scan it first. The codes are stored for a large number of "drive cycles" before they self-clear. There are codes that do not turn on the SES light. If it was a problem with the fule pump circuit, it will not necessarily set a code. You can bypass the relay and the PCM/security interlocks by powering the pump from the prime connector under the hood near the PCM.

 

Fred is 100% correct don't fall for the cheap ones you will regret it later! There was a guy selling brand new Delphi optis at the best price I could find anywhere. Next was Summit in as far as price. Bottom line you get what you pay for ;-)

Dave

 

I've drove it both nights from 20 minutes to 1 hour and nothing no sputtering i can stop shut it off and come back and it will start back up. So my question now is where is the cheapest place i can take this z28 to get the codes read. Thank you

 

took it to orielly's this morning and they scanned it. Guess what says car not signalling with scanner then the guy said it wont scan unless the light is on. Sooo i drove it and hours drive down to my parents and drove back no problems.

 

Well, don't go back there...the guy is wrong about not being able to connect unless the light is on. 93 and 94 cars do not have power at the ALDL like later cars do. Scanners for these cars need to be self powered to work. My old snap-on scanner has a lighter plug attachment to work with these situations and it works fine.....

Good luck!

 

There is a app for your smart phone that can scan for codes in your car does some other
cool stuff to !! and its cheap!! I have never used it but 4 people on here said that it works great!!

 

They only apps I've seen are OBD2....this car is OBD1.

 

Thanks man you just saved me some cash. no one said anything about it not working on my car
just looked at the ( torque pro app ) details works on cars back to 1996 ( OBD2 )
I will go to my thread on torque pro app ??? and let your information be known. thank you again

 

Strictly OBDI code readers and scan tools are getting scarce. You have to get a combo OBDI/II, which is the way to go, as there haven't been any OBDI cars built since '95. Most parts store do not pull codes on OBDI cars.

 

Found another app ( OBD trouble code look up ) works with OBD 1 & 2
but it does not read the code just tells you what the code means

 

Shoebox has the best LT1 code list on the planet. Using generic lists is often misleading or unclear.