No Start

PATRICK FLOHE

MEMBER
1988 BUICK CENTURY
2.5L
4 CYL
180,000 MILES

Engine was running rough, then after stopping / shut-down, it was fine. After another stop, it ran very poorly.
Now it will not start at all.
Got good strong spark at each plug, but will only occasionally barely fire while cranking.
I noticed the electric fan kept coming in when cranking, so changed the coolant sensor and it no longer does that. Still will not start.
Changed MAP & MAT sensors, and still nothing.

I hate to go down the path of changing parts like ICM and Coil Pack, ECM.I have good strong spark.
Fuel pump sounds good and strong, and is less than two years old. A/C Delco / Delphi unit.
As it is an older car and 2.5, it has no pressure sensing port for fuel pressure.

Any thoughts?

3 Replies

HMAC300

MECHANIC
48,601 POSTS

If it has a distributor check that the reluctor used to crack on these so you would get occasional spark the reluctor is the wheel looking thing inside dist. See pics to diagnose

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Tuesday, March 21st, 2017 AT 6:29 AM

PATRICK FLOHE

MEMBER
20 POSTS

No distributer.
It's a coil pack set-up, and it sparks very strongly.

Do you think it's a fuel pressure regulator?
According to the manual, it's on the TBI unit.
****I found the Pressure Regulator in the manual, and it's nothing but a diaphragm, spring, spring seat, and cover.****
The guy at O'Reilly, said he's never had to sell one.