93 Bonneville SSEi - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-08-2011, 03:06 PM   #1
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Default 93 Bonneville SSEi

Helllllllllllp!!!!! Please.
I'm almost ready to take a sledge hammer to this car.
Problems:
1. Immediate fuel pressure loss at engine shut down. New Fuel Filter - nope. New Fuel Press Reg - nope. Injectors not leaking. Took off throttle body. Cleaned components, replaced some. New gasket.
2. Ran a vacuum test to see if I had a leak anywhere. Nope
3. High oil pressure. New PCV, oil filter. new sending unit - nopes
4. Long time smell of coolant, but no puddle. I believe the water pump is shot. Could cause high oil pressure - but it'* not running hot.
5. This is the kicker, it then developed a big coolant leak. Probably one of the metal lines. [U[B]]The coolant has fuel in it!!!!???? Not oil. Oil is not milky.
6. Trouble code 55 (if memory serves) ECM connection or knock sensor. When I went to replace the knock sensor, my temper got the best of me. I haven't even looked at the car for 2 months. But now, I'm ready for round 15.
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Old 06-08-2011, 03:14 PM   #2
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A fuel pump that'* starting to go out will leak back and loose fuel pressure.

Very odd. There is no way fuel can get in to the coolant. totally separate system.

Check the oil pressure with a mechanical oil pressure tester.

Where do you smell coolant? Under the hood, in the exhaust? A bad water pump wont give you high oil pressure. It will just make the engine over heat.

Code 55 a/d converter error or pcm not grounded or lean fuel or grounded reference voltage. I think I would start checking wires on this one.
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Old 06-08-2011, 03:38 PM   #3
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Thanks for the quick response.
Coolant smell was coming from under the hood. No puddle. Had to fill the overflow tank about every 6 weeks. Yes. I know I shouldn't have had fuel in my coolant. I suppose it could have been the coolant picking up engine residue. Seemed like alot of petroleum though. I'll get a mechanical oil pressure guage and let you know. What is an a/d converter, please?
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Old 06-08-2011, 08:15 PM   #4
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CODE 55
Trouble Code 55 indicates that the Analog- to-Digital (A/D) converter in the ECM timed out. The ECM checks this by initiating a conversion and timing how long it takes to complete. If the converter, for whatever reason, fails to signal the End-Of-Conversion (EOC) before a timeout counter runs down, the ECM assumes it is bad and sets this code.
Possible causes for Code 55 are limited to:
1. Defective or incorrectly inserted MEM-CAL
2. Defective ECM
If replacing the ECM, be sure to transfer both the PROM and the CALPACK from the old unit. If the old-ECM also indicated PROM failure (Code 51) or a bad CALPACK (Code 52), be sure to verify these components are fully operational in the new unit. If they are not, they too will have to be replaced.

like dan said look for shorted wires, chafed to ground or each other first
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