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Car Forum / Nissan / Nissan Z Cars / June 20041990 300ZX fuel mileage
Recently I checked the gas mileage that I am getting now with my 1990 300ZX. It appears as though I am only averaging 16.3 mpg. The vehicle has 163,000 miles on it and has been tuned up within the last 8 months. Just out of curiosity, what kind of mileage are you guys getting with your Z-32s(1990-1996 non-turbos)? When mine was new, it would average around 24 mpg. V.H. I get 24 - 26 highway with a 1993 300Z 2+2. I would check the air filters or see if the CAT's are clogged. > Recently I checked the gas mileage that I am getting now with my 1990 300ZX. > It appears as though I am only averaging 16.3 mpg. The vehicle has 163,000 [quoted text clipped - 4 lines] > > V.H. > Recently I checked the gas mileage that I am getting now with my 1990 > 300ZX. It appears as though I am only averaging 16.3 mpg. The vehicle has > 163,000 miles on it and has been tuned up within the last 8 months. Just > out of curiosity, what kind of mileage are you guys getting with your > Z-32s(1990-1996 non-turbos)? When mine was new, it would average around 24 > mpg. Have someone check the ignition timing. I've seen a few of the early cars have problems with the drive peg wearing in the drivers side exhaust cam which retards the timing slowly over time. That or maybe you have some weak O2 sensors making it run rich?  SignatureSteve http://www.atlantaracing.com > > Recently I checked the gas mileage that I am getting now with my 1990 > > 300ZX. It appears as though I am only averaging 16.3 mpg. The vehicle has [quoted text clipped - 7 lines] > which retards the timing slowly over time. That or maybe you have some weak > O2 sensors making it run rich? Steve, The car is DEFINITELY running rich. Wouldn't pass the low speed idle emissions test this year in N.C. Local mechanic says it needs a valve job--and that cylinder no. 5 is skipping. He performed a cylinder leakdown test on the car for me. However, this problem could be coupled with some weak 02 sensors. Other than this problem, the car cranks and runs fine. I still enjoy driving it after all these years. May just hang on to it for several more years to come. V.H. > -- > > Steve > > http://www.atlantaracing.com > Steve, > [quoted text clipped - 3 lines] > test on the car for me. However, this problem could be coupled with some > weak 02 sensors. That's what I'd be trying. Put a couple of new O2 sensors and replace the FI temp sensor and it's connector. If it's a NA, junka odd to have valve problems, if it was a turbo I have seen a couple of them with roasted valves. I have seen them with high miles have low compression when they are running too rich due to washed down cyl walls. Most "pulled out" of it once the rich condition was corrected. SignatureSteve http://www.atlantaracing.com V.H. (me@thecomputer.com) wrote on Wednesday 26 May 2004 10:06 am: > Recently I checked the gas mileage that I am getting now with my 1990 > 300ZX. It appears as though I am only averaging 16.3 mpg. The vehicle has [quoted text clipped - 4 lines] > > V.H. If I go 55-60 MPH on the freeway, I get about 30 MPG on my '90 twin turbo. I've never gotten anything as low as 16, AFAIk. SignatureMichael White "To protect people from the effects of folly is to fill the world with fools." -Herbert Spencer, 1891 before my tranny locked up (see my recent post :) I would get about 14-20 MPG average, if I PUSHED her hard, less if PUSHED EVEN Harder ;-) but a fair 18-24 MPG City/Hwy if I drove her gently. 55-65 MPH and NO hard accelerations > Recently I checked the gas mileage that I am getting now with my 1990 300ZX. > It appears as though I am only averaging 16.3 mpg. The vehicle has 163,000 [quoted text clipped - 4 lines] > > V.H. |
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