3.4 starts with low idle and dies (Page 1/1)
Atlanta1 AUG 06, 04:04 PM
Hey guys I have a 88 fiero with a 3.4 swap and the engine starts and runs dies off about
a minute or 2 later then it will start right up and do the same..Here are some of the issues
Rpm is at 750 start and does not match the tach which shows around 1200 even when revving its off
running rich.Also battery starts off at 11.2 volts then goes to 12.1 when revving the engine
code 35
MAP 2.2 volts
o2 cross counts 45
IAC 102 steps
spark advance 45 degrees
would appreciate some feedback to find the root cause of my problem

[This message has been edited by Atlanta1 (edited 08-06-2023).]

Patrick AUG 06, 07:33 PM

quote
Originally posted by Atlanta1:

Also battery starts off at 11.2 volts then goes to 12.1 when revving the engine



I can't believe those readings were taken with an accurate voltmeter.
Atlanta1 AUG 06, 07:48 PM
I used a fiero scan tool I was able to go to 13 volts around 1800 rpms
which my tach showed me around 3000 rpm.
Patrick AUG 06, 08:08 PM

I don't believe the engine would even turn over with only 11.2 volts.

A charged battery is 12.6 volts.

The alternator should be putting out 14.7 volts.