runs rough when hot
runs rough when hot
I've owned my van for a week and have driven it twice. I dont know much about the history of it but was told it had heads replaced due to an overheating issue. My first thought of the poor running condition is that it needed a cat converter. I cut it out and it was clean. I then changed the fuel pressure regulator and the coolant temp sensor. It runs fine for about a half an hour then feels like its loading up, doesnt want to go over 30 mph and it almost sounds like the engine is being choked. Any ideas ? possible exhaust clog ? cant understand why it takes 30-45 mins for it to start running poorly when it gets up to temp in about 5.
Thanks...
Stevie B
Stevie B
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kings-x59
- I plan to be buried in my van
- Posts: 1374
- Joined: Thu Sep 21, 2006 7:50 pm
- Location: Cypress, Tx
Re: runs rough when hot
post the year model of the van, it will help with responses....
'89 Astro, 4.3L, TBI. Minor intake and exhaust mods. Rebuilt 700R4 trans (by me). Corvette servo, 0.5" boost valve, police grade 1-2 accumulator spring (shifts fast and solid). B&M stacked plate trans cooler. Bilstein shocks. Belltech sway bars front and back. New head unit, speakers and subwoofer. Needs paint and a new headliner.
name's Steve
I can't remember all I've forgotten about that....
name's Steve
I can't remember all I've forgotten about that....
Re: runs rough when hot
Sorry... I thought I had done that. Its a 2000 4.3
Pulling my hair out on this one. Today I changed the plugs, wires, cap and rotor and it still runs like crap after about a half hour of driving. Any help is appreciated.
Pulling my hair out on this one. Today I changed the plugs, wires, cap and rotor and it still runs like crap after about a half hour of driving. Any help is appreciated.
Thanks...
Stevie B
Stevie B
-
Moreforles
- I sleep in my van
- Posts: 354
- Joined: Fri Feb 22, 2008 8:35 am
- Location: Cleveland, Ohio
Re: runs rough when hot
had full sized van w/around 300,000 miles on it, that acted that way, but it died before I figured it out, I was thinking loss of compression, might try testing it...
2000 Astro, passenger van. Converted into a cargo van, used for Carpet cleaning (10 lbs of crap, in a 5 lb bag)
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LiftedAWDAstro
- I have my van tatooed on my cheeks
- Posts: 4379
- Joined: Sat Sep 09, 2006 3:35 pm
- Location: New Haven, NY
Re: runs rough when hot
Any SES codes? Does the light work? If the converter was bad you should be getting a PO420 code. I would have to think the ignition coil would be warm/hot enough to start acting up after 1/2 an hour of driving.
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition
Mileage spreadsheet
Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition
Mileage spreadsheet
Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
Re: runs rough when hot
The fuel pump may be getting warm and binding after running for a while.
They don't always go bad and stop all of a sudden.
I had this happen on another vehicle.
I was able to attach a fuel pressure gauge to the fuel rail and tape it to the windshield
and watch the pressure while I drove.
When it started acting up the fuel pressure dropped.
It would idle fine but run very rough under a load.
They don't always go bad and stop all of a sudden.
I had this happen on another vehicle.
I was able to attach a fuel pressure gauge to the fuel rail and tape it to the windshield
and watch the pressure while I drove.
When it started acting up the fuel pressure dropped.
It would idle fine but run very rough under a load.
Re: runs rough when hot
Thanks for all the help.... I finally got the codes, P300, P172 & P175. I changed the left front O2 sensor and the coolant temp sensor and it runs great now.
Thanks...
Stevie B
Stevie B
-
LiftedAWDAstro
- I have my van tatooed on my cheeks
- Posts: 4379
- Joined: Sat Sep 09, 2006 3:35 pm
- Location: New Haven, NY
Re: runs rough when hot
Glad you got her running great! =D>
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition
Mileage spreadsheet
Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition
Mileage spreadsheet
Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
Re: runs rough when hot
Good to hear stevieb, and thanks for letting us know the outcome. Hopefully that info will help someone else down the roadstevieb wrote:Thanks for all the help.... I finally got the codes, P300, P172 & P175. I changed the left front O2 sensor and the coolant temp sensor and it runs great now.
