New-b needs help!
#1
![Unhappy](/gm/images/icons/icon9.gif)
I just bought a 92 Bonneville SE and I have an intermittent hesitation issue. Engine power seems to surge- sometimes it is totally fine and other times it has a lot of trouble. RPM'* and oil pressure drop, come back, drop, come back. I don't even know where to start. It could be an oil issue because the pan has a good size dent in it, but I don't know why it would be intermittent if that was it. Don't know if oil pressure is the cause of the problem, or a symptom of another problem. PLEASE HELP!
#2
Retired
![](https://www.gmforum.com/images/ranks/veteran_army.png)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Oil pressure is going to drop along with the engine RPM, this is pretty much normal.
Let'* start with the basics.
Last time tune up was done?
Oil change done?
Any other mechanical maintenance that you are aware of that was done recently(past year).
Any modifications?
Let'* start with the basics.
Last time tune up was done?
Oil change done?
Any other mechanical maintenance that you are aware of that was done recently(past year).
Any modifications?
__________________
Retired Administrator
Retired Administrator
#3
Retired
![](https://www.gmforum.com/images/ranks/veteran_army.png)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Moved to the 1992-1999 Bonneville section for better visibility.
__________________
Retired Administrator
Retired Administrator
#5
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Oil change was done as soon as the problem happened. The car sat for a few months before i bought it but fuel stabilizer was in it. I haven't done a tune up yet (just bought it). Only other thing I have done to it is it had two starting issues- both electrical. Neutral safety switch is bad so I just made a bypass circuit with a start button in the door (because im broke and a new switch is $120) and the key pellet contacts werent reading properly so I spliced in a series of resistors to match the key'* ohms to bypass the securit y system. No performance mods.
#8
Retired
![](https://www.gmforum.com/images/ranks/veteran_army.png)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
So, you have only owned this car for a short period, and it has sat for a few months prior to that? Besides the electrical issues that you seem to have handled in a redneck way(bravo!), I'm going to suggest a tuneup. Sparkplugs, wires. Clean the MAF sensor with MAF sensor safe cleaner. I think that'* about it for now.
Oh, I see Roy already asked but you didn't answer. Check engine light?
Oh, I see Roy already asked but you didn't answer. Check engine light?
__________________
Retired Administrator
Retired Administrator
#10
![Default](https://www.gmforum.com/images/icons/icon1.gif)
I really appreciate the quick responses folks thank you! No check engine light. I know I should do a tune up asap, but can you guys give me any pointers on diagnosing the problem without throwing parts in it to see if that fixes it? As I said I'm broke, and i don't want to spend money on stuff that might be fine.