| Author | Message | ||
     Rob Davison (Nosivad_bor) Senior Member Username: Nosivad_bor Post Number: 177 Registered: 02-2003 |
my rangie is having serious issues starting. the symptoms. i turn the key and the truck turns over then barely runs , sputtering and stalloing out seconds later. seems like a fuel starvation issue. experiment. spray starter fluid into the intake, fucker fires up and then nocks hard until fluid is burned up, point is it needs fuel. i changed fuel filter , new stepper motor and i clean the throttle potentiometer (had loose tar deposits on it) problem will go away for 1 or two days then act up. happens when engine is cool or hot. my conclusion is fuel pump is nearly dead and is barely pumping. though once the car does start it runs like a champ. or maybe my MAF is going? i have no experience with MAF issues so i dont know the symptoms. other issues; i am missing the exhaust from the first muffler (it's there) everything past it fell off. i mention this thinking i might have a bad 02 sensor and it's totally fucking up my fuel mixture. i am in the process of getting the exhaust replaced but i am getting flack for replacing my CAt with a used one, so i need to find another garage. any ideas? rd | ||
| Nick Hall (Ngh) New Member Username: Ngh Post Number: 3 Registered: 01-2003 |
Are you getting an EFI light? 2 things I would try: 1. make sure you installed the fuel filter correctly i.e. look to see that the arrow is poiting the right way for proper feul flow. 2. you can check the stepper motor by removing it from the plenum chamber and reconnecting the electrical power to it. Then go turn the ignition to the position right before 'start'. Go back and make sure that the plunger on the stepper motor is actually pushed out. It's a simple way to check that the thing is actually working. If those 2 check out, then get a fuel pressure tester; then make sure you didn't screw the TPS. My guess is that removing the TPS brought it out of spec. Just a guess though. You can also test this item with a VOM by ensuring a smooth swing 'o the needle on the meter. If not smooth, then replace it. Hope this helps. Nick | ||
| Rob Davison (Nosivad_bor) Senior Member Username: Nosivad_bor Post Number: 180 Registered: 02-2003 |
i did all these things after the symptoms occured. on my 89 there seems to be only one way the TPS can fit in, on my 88 it is sloted bolt holes and would take some adjustment. the stepper motor is new and i made it the same height (push the spring down and screewed) as the one i took out. the EFI light is NOT on except for the light check when i first turn the car on, and it is not burnt out. fuel filter was fitted and the car started. the car has acted normal all day today in a few minutes i'll check the pressure. | ||
| Peter Matusov (Pmatusov) Senior Member Username: Pmatusov Post Number: 567 Registered: 09-2002 |
my '89's idle at Park or Neutral is about 1200 rpm now - wouldn't keep the idle in gear otherwise. I suspect the same thing - fuel pump all but gone. | ||
| Rob Davison (Nosivad_bor) Senior Member Username: Nosivad_bor Post Number: 181 Registered: 02-2003 |
FUCK ME.. I HAVE NO FUEL PRESSURE VALVE TO CHECK i'll be changing the fuel pump with fingers crossed | ||
| Peter Matusov (Pmatusov) Senior Member Username: Pmatusov Post Number: 568 Registered: 09-2002 |
chill, bubba. i haven't found mine yet, but i am told it's there. | ||
| Nick Hall (Ngh) New Member Username: Ngh Post Number: 4 Registered: 01-2003 |
Gents, You can also test to see if the fuel pump is getting the required voltage. I do not know the exact numbers but you can probably search this site and find out. I recall something like 10v? Also suspect the fuel pressure regulator, which is known to fail . Don't throw parts at it yet... (even though your fuel pump is probably 14 years old). | ||
| Greg Hirst (Gregh) Member Username: Gregh Post Number: 115 Registered: 10-2002 |
Rob- Did you mean that you don't have a fuel pressure guage to check pressure? It's worth a few bucks to have one to check before buying new pump. Should be 34-37 PSI. Sparkplugs appear dry and no fuel smell? Any anemic noises coming from pump? There's multimeter leads up behind driver side rear wheel above frame to check power/voltage to pump. You have verified you're getting no or low pressure fuel, right? Nothing obvious like only happening with low fuel in tank thus water or crap in tank, right? Also-check fuel pump relay for good contact and maybe replace if malfunctioning. There's also a main fuel injection relay too. Both are located under pass. seat. Or were you referring to fuel regulator? It's located right below the stepper motor on pass. side rear of plenum. I think it just bleeds off excess fuel back to tank but could you exchange one from the '88 to check if functioning? If it is the fuel pump, it's too bad you don't have a '90 with nice access hole to get to it! PITA pulling tank! Let us know how it goes- Good luck! | ||
| Rob Davison (Nosivad_bor) Senior Member Username: Nosivad_bor Post Number: 182 Registered: 02-2003 |
okay. i decided not to mess with it becasue the car is running fine. i will check the relays under the seat and the various other components. i want to install a shrader valve into the rubber hose after the fuel filter so that i can check pressure when i get an urge. the fuel pump is 14 years old so i am replacing it anyway. is ther such a thing as an after market fuel pressure vavle i can spolice in there? i'll be checking JEGGS catolouge for that. i will cut an access panel in so if something goes wrong again i can check it with ease. having no access panel is better than having ABS breaks, i'll take the 89 any day. i have my 88 parts car so i have spare relays i can swap over and compare with. i am aware of a few other tid bits that might be going bad that i have to check with. i'll let you all know when i get the time. looks like i wont touch the car until next weekend. rd | ||
| LEON KEDZIERSKI (Rovertech) New Member Username: Rovertech Post Number: 17 Registered: 12-2002 |
CHECK THE CONNECTOR UNDER THE DRIVER SEAT THAT GOES TO THE ROLLOVER VALVE CHECK FOR CONNECTOR TURNING BROWN OR THE CONNECTOR WARM . CLEAN CONTACTS. ALSO CONNECTOR IN LEFT REAR WHEEL WELL AT FRAME LEADS TO PUMP | ||
| Rob Davison (Nosivad_bor) Senior Member Username: Nosivad_bor Post Number: 269 Registered: 02-2003 |
UPDATE: the car seemed to fix itself for about a month but lacked balls going up hills. also it didn't like it if i feathered that gas pedal quickly. 2500-3500 rpm was a dead spot, RMP's went up no extra power. symptom returned and car would not start except for a few seconds with starting fluid. tried next morning, car fired up, i drove around and then shut it of, barely started 5 minutes later and then eventually would not start. finally i replaced fuel pump on a beautiful day, i cut access panel and , thank god, my screws were not rusty and i was changed over and finished 100% in 4 hours.i used the one that was originally for the '89 caddillac seville. first thing i notice is the car immediately starts now and has a loud roar before the idle comes down in a second. very strong starting indeed. before the car ALWAYS took two turns of the ignition, like the first attempt primed the system and the second got it running. also i do not have the dead spot at 2500-3500 going up hills anymore. this was apparently my "cure all" dare i say that out loud. thanks for all the input rob | ||
| Greg Hirst (Gregh) Member Username: Gregh Post Number: 155 Registered: 10-2002 |
Good for you, Rob!  How much was the fuel pump? Thanks- | ||
| Rob Davison (Nosivad_bor) Senior Member Username: Nosivad_bor Post Number: 271 Registered: 02-2003 |
eh... $67 with new filter bag that hangs out the end. rd | ||
| eric johnson (Eric2) New Member Username: Eric2 Post Number: 5 Registered: 05-2003 |
So I owe you $10 bucks. | ||
| Greg Hirst (Gregh) Member Username: Gregh Post Number: 170 Registered: 10-2002 |
Eric-Different vehicle, different prob. Your $10 is still safe. | ||
| Rob Davison (Nosivad_bor) Senior Member Username: Nosivad_bor Post Number: 299 Registered: 02-2003 |
greg, shuddup... i'm getting ten dollars for some reason let the man give it | ||
| Greg Hirst (Gregh) Member Username: Gregh Post Number: 171 Registered: 10-2002 |
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